[PATCH] xserver: xorg-server.m4: use PKG_CONFIG variable rather than executable name

[Gaetan Nadon]

Hi,

This is a preventive maintenance patch to fix a dormant bug. It is
intended for the git master branch.
The xorg-server macro  XORG_DRIVER_CHECK_EXT() uses the hard-coded
executable name "pkg-config" (without a path) rather than the variable
PKG_CONFIG which is defined during configuration:


        checking for pkg-config... /usr/bin/pkg-config
        checking pkg-config is at least version 0.9.0... yes
        

The user is invited to overwrite the value of PKG_CONFIG if need be.
This feature will only work if all invocation of this program is done
through PKG_CONFIG variable. All driver modules use this macro. Output
of ./configure --help:


        Some influential environment variables:
        ...
        PKG_CONFIG  path to pkg-config utility


For reference:
========

This is the code that gets executed when the macro is expanded (example
using from driver/acecad):


        # Checks for extensions
        
        
        	SAVE_CFLAGS="$CFLAGS"
        	CFLAGS="$CFLAGS -I`$PKG_CONFIG --variable=sdkdir xorg-server`"
        	cat >conftest.$ac_ext <<_ACEOF
        /* confdefs.h.  */
        _ACEOF
        cat confdefs.h >>conftest.$ac_ext
        cat >>conftest.$ac_ext <<_ACEOF
        /* end confdefs.h.  */
        
        #include "xorg-server.h"
        #if !defined RANDR
        #error RANDR not defined
        #endif
        
        int
        main ()
        {
        
          ;
          return 0;
        }
        _ACEOF


And the result of the test for RANDR is:


        configure:12628: checking if RANDR is defined
        configure:12630: result: yes





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