Fixes problem with pkg-config and building xorg drivers

Add this file to your xserver package directory.

If you have PKG_CONFIG_ALLOW_SYSTEM_CFLAGS or PKG_CONFIG_ALLOW_SYSTEM_LIBS defined
pkg-config will substitute sysroot for every instance of /usr/include, /usr/lib/, etc.

When calling pkg-config xorg-xserver it would return a mangled path to /usr/include/pixman-1.
This patch copies what is done in xserver-1.5.

Dan Lykowski
Dynon Avionics
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