Fix CURL_CHECK_LIBS_LDAP failure when no parameter is given

Default check for more libraries in CURL_CHECK_LIBS_LDAP,
and allow parameter specification of libraries to check.

Avoid depending on a header file for the definition of NULL

Fix LDAP compile error when LDAP is not available.
Fixed a typo in the LDAP configure code and made sure NULL is defined
in a test programs that need it.

Fix custom check for LDAP libraries

Add custom check for LDAP libraries

Add custom checks for lber, ldap, ldapssl and ldap_ssl header files

Add check for winldap and winber header files

Enabled a few more gcc warnings with --enable-debug. Renamed a few
variables to avoid shadowing global declarations.

Patrick Monnerat modified the LDAP code and approach in curl. Starting now,
the configure script checks for openldap and friends and we link with those
libs just like we link all other third

Patrick Monnerat modified the LDAP code and approach in curl. Starting now,
the configure script checks for openldap and friends and we link with those
libs just like we link all other third party libraries, and we no longer
dlopen() those libraries. Our private header file lib/ldap.h was renamed to
lib/curl_ldap.h due to this. I set a tag in CVS (curl-7_17_0-preldapfix)
just before this commit, just in case.

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Peter O'Gorman pointed out (and fixed) that the non-blocking check in
configure made libcurl use blocking sockets on AIX 4 and 5, while that
wasn't the intention.

--enable-sspi only supported on Windows native builds

Cleanup. Warnings related with FD_SET, FD_ISSET, and FD_ZERO macros
are not icc 9.0 specific.

Daniel Johnson's fix for shared object extension detection on Mac OS X.

fix wrong macro name introduced in las commit

Add check for compiler variadic macro support in configuration script

attempt to keep message length below 80 chars

icc 9.0 when compiling its generated code for its own FD_SET,
FD_ISSET, and FD_ZERO macros emits warnings #1469 and #593.
So for icc 9.0 we also ignore warnings #1469 and #593.
* 593 warn

icc 9.0 when compiling its generated code for its own FD_SET,
FD_ISSET, and FD_ZERO macros emits warnings #1469 and #593.
So for icc 9.0 we also ignore warnings #1469 and #593.
* 593 warns on "variable __d0 was set but never used"
* 1469 warns on "cc clobber ignored"

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Added last-resort dynamic library names.

Properly use libtool macros to fix OpenLDAP library name detection on Darwin.

Added a check in configure that verifies if <signal.h> is available,
defining HAVE_SIGNAL_H if the header is available.

Added a check in configure that tests if the sig_atomic_t type is

Added a check in configure that verifies if <signal.h> is available,
defining HAVE_SIGNAL_H if the header is available.

Added a check in configure that tests if the sig_atomic_t type is
available, defining HAVE_SIG_ATOMIC_T if it is available. Providing
a suitable default in setup_once.h if not available.

Added a check in configure that tests if the sig_atomic_t type is
already defined as volatile, defining HAVE_SIG_ATOMIC_T_VOLATILE
if it is available and already defined as volatile.

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Added a check in configure that simply tries to run a program (not when
cross-compiling) in order to detect problems with run-time libraries that
otherwise would occur when the sizeof tests f

Added a check in configure that simply tries to run a program (not when
cross-compiling) in order to detect problems with run-time libraries that
otherwise would occur when the sizeof tests for curl_off_t would run and
thus be much more confusing to users. The check of course should run after
all lib-checks are done and before any other test is used that would run an
executable built for testing-purposes.

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Check for struct timeval at configuration time

Being unable to link or find out recv() or send() args types is a fatal error.

Avoid the risk of a false positive detection of MSG_NOSIGNAL when cross compiling a Windows target.