We use this in the sim tree currently. Rather than require people to
have pkg-config installed, include it in the config/ dir.
config/ChangeLog:
* pkg.m4: New file from pkg-config-0.29.2.
<toplevel>
* configure.ac: Don't use pkg-config to check for bdw-gc.
* configure: Regenerate.
config/
* pkg.m4: Remove.
libobjc/
* configure.ac: Don't use pkg-config to check for bdw-gc.
* configure: Regenerate.
gcc/
* doc/install.texi: Don't use pkg-config to check for bdw-gc.
From-SVN: r243108