fix: for exporters to work for build config, there may be two include dirs

For CMake / pkg-config configuration files to be used for an uninstalled
build, the include directory in the bu

fix: for exporters to work for build config, there may be two include dirs

For CMake / pkg-config configuration files to be used for an uninstalled
build, the include directory in the build directory isn't enough, if that
one is separate from the source directory. The include directory in the
source directory must be accounted for too.

This includes some lighter refactoring of util/mkinstallvars.pl, with the
result that almost all variables in builddata.pm and installdata.pm have
become arrays, even though unnecessarily for most of them; it was simpler
that way. The CMake / pkg-config templates are adapted accordingly.

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24918)

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fix: exporters/cmake/OpenSSLConfig.cmake.in to work for build config

This template file is made to make both:

1. OpenSSLConfig.cmake (CMake config used when building a CMake package

fix: exporters/cmake/OpenSSLConfig.cmake.in to work for build config

This template file is made to make both:

1. OpenSSLConfig.cmake (CMake config used when building a CMake package
against an uninstalled OpenSSL build)
2. exporters/OpenSSLConfig.cmake (CMake config that's to be installed
alongside OpenSSL, and is used when building a CMake package against
an OpenSSL installation).

Variant 1 was unfortunately getting the internal '_ossl_prefix' variable
wrong, which is due to how the perl snippet builds the command(s) to figure
out its value. That needed some correction.

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24918)

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Fix cmake generator

PR #24678 modified some environment variables and locations that the
cmake exporter depended on, resulting in empty directory resolution.
Adjust build build.info

Fix cmake generator

PR #24678 modified some environment variables and locations that the
cmake exporter depended on, resulting in empty directory resolution.
Adjust build build.info and input variable names to match up again

Fixes #24874

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24877)

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Adapt all the exporter files to the new vars from util/mkinstallvars.pl

With this, the pkg-config files take better advantage of relative directory
values.

Fixes #24298

Adapt all the exporter files to the new vars from util/mkinstallvars.pl

With this, the pkg-config files take better advantage of relative directory
values.

Fixes #24298

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24687)

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exporters/cmake/OpenSSLConfig.cmake.in: Detect missing `platform->sharedlib_import`

Some platform implementations are without `sharedlib_import()`, so we need
to check that it exists bef

exporters/cmake/OpenSSLConfig.cmake.in: Detect missing `platform->sharedlib_import`

Some platform implementations are without `sharedlib_import()`, so we need
to check that it exists before using it.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/22789)

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Add exporters for CMake

CMake's older package finder, FindOpenSSL.cmake, does a best guess effort
and doesn't always get it right.

By CMake's own documentation, that's what such

Add exporters for CMake

CMake's older package finder, FindOpenSSL.cmake, does a best guess effort
and doesn't always get it right.

By CMake's own documentation, that's what such modules are (best effort
attempts), and package producers are (strongly) encouraged to help out by
producing and installing <PackageName>Config.cmake files to get a more
deterministic configuration.

The resulting OpenSSLConfig.cmake tries to mimic the result from CMake's
FindOpenSSL.cmake, by using the same variable and imported target names.
It also adds a few extra variables of its own, such as:

OPENSSL_MODULES_DIR Indicates the default installation directory
for OpenSSL loadable modules, such as providers.
OPENSSL_RUNTIME_DIR Indicates the default runtime directory, where
for example the openssl program is located.
OPENSSL_PROGRAM Is the full directory-and-filename of the
openssl program.

The imported targets OpenSSL::Crypto and OpenSSL::SSL are as precisely
specified as possible, so for example, they are specified with the both the
import library and the DLL on Windows, which should make life easier on that
platform.

For the moment, one of the following must be done in your CMake project for
this CMake configuration to take priority over CMake's FindOpenSSL.cmake:

- The variable CMAKE_FIND_PACKAGE_PREFER_CONFIG must be set to true prior
to the 'find_package(OpenSSL)' call.
- The 'find_package' call itself must use the "Full Signature". If you
don't know any better, simply add the 'CONFIG' option, i.e. from this
example:

find_package(OpenSSL 3.0 REQUIRED)

to this:

find_package(OpenSSL 3.0 REQUIRED CONFIG)

Just as with the 'pkg-config' exporters, two variants of the .cmake files
are produced:

- Those in 'exporters/' are installed in the location that 'pkg-config'
itself prefers for installed packages.
- Those in the top directory are to be used when it's desirable to build
directly against an OpenSSL build tree.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20878)

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