Fix GH-15501: Windows HAVE_<header>_H macros defined to 1 or undefined (#15508)

Previously the CHECK_HEADER_ADD_INCLUDE function defined the
`HAVE_<header>_H` preprocessor macros to valu

Fix GH-15501: Windows HAVE_<header>_H macros defined to 1 or undefined (#15508)

Previously the CHECK_HEADER_ADD_INCLUDE function defined the
`HAVE_<header>_H` preprocessor macros to value 0 or 1 whether the
`<header.h>` file was found. This syncs it with Autotools build system
where most of these macros are either undefined or defined to 1.

In possible edge cases where such macros might be intentionally used
like this without being aware that HAVE_HEADER_H can be 0 or 1 on
Windows:

| #ifdef HAVE_HEADER_H
| ...
| #endif

there is backwards incompatibility for PECL extensions in case the
header wouldn't exist on Windows such code wouldn't execute. However,
this is considered a bug if such case is present. From the Autotools
point of view, the check is correct though and should be used with
ifdef/defined() checks.

Help text is also synced to Autotools style:
`Define to 1 if you have the <header.h> header file.`

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Rename @cname to @cvalue in stubs (#9043)

@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as

Rename @cname to @cvalue in stubs (#9043)

@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as @cvalue would be more appropriate.

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Fix GH-8750: Can not create VT_ERROR variant type

We add support for creating `VT_ERROR` variants via `__construct()`,
and allow casting to int via `variant_cast()` and `variant_set_type

Fix GH-8750: Can not create VT_ERROR variant type

We add support for creating `VT_ERROR` variants via `__construct()`,
and allow casting to int via `variant_cast()` and `variant_set_type()`.
We do not, however, allow type conversion by other means, to avoid
otherwise easily introduced type confusion. VB(A) also only allows
explicit type conversion.

We also introduce `DISP_E_PARAMNOTFOUND` which might be the most
important `scode` for this purpose, since this allows to skip optional
parameters in method calls.

Closes GH-8886.

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Declare ext/com_dotnet constants in stubs (#8675)

Remove extra space before param default values

Use single line phpdoc in stubs where possible

Not serializable flag permeation

Generate class entries from stubs for com, standard, xmlreader, xmlwriter, xsl, zip, Zend

Closes GH-6706

Add missing stub for com_exception

Update ext/com_dotnet parameter names

Closes GH-6296.

Promote warnings to Error in COM extension

Closes GH-6141

Add more precise type info for stubs

Closes GH-6005

Add another round of missing parameter types to stubs

Closes GH-5950

Add a few missing parameter types in stubs

Related to GH-5627

Fix typo (UNKOWN -> UNKNOWN)

Clean up constructor handling in com_dotnet

We substitute the construction magic with standard constructors, move
the ZPP checks to the beginning of the ctors, and also let the function

Clean up constructor handling in com_dotnet

We substitute the construction magic with standard constructors, move
the ZPP checks to the beginning of the ctors, and also let the function
entries be generated from the stubs.

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Verify that all stubs have a return type

Add union return types for function stubs

Add com_dotnet function stubs