libhib: fix build on PowerPC

Add a patch to remove some stupid configure.ac that does completely
crazy things with the CFLAGS and CXXFLAGS leading to build failures
like:

  http://autobuild.buildroot.org/results/7beec6b72652cc118240c959ed744ee5f2991c12/build-end.log



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>