Upstream uses AC_CHECK_FILE to find dri.h, but that errors out when
cross-compiling. Until oe-core 1b0d9cb1801a8eb68c82dfcda5a1da420ac8dd83 this
wasn't a problem because we patched AC_CHECK_FILE to always pass, which was a
nasty hack.
Patch configure.ac to use pkg-config like it should, and not AC_CHECK_FILE.
(From OE-Core rev: a7fe0d17c50d9b38ce33fe39e677da349d1d358c)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>