Fix for X86 target

Fix for X86 target

The X86 target couldn't compile some tests that use assembly, but it can
compile other things that now depend on some projects in the test subdir
(namely libtestUtil for OpenGL tests)

Also fatblock was including <sys/endian.h> directly instead of
<endian.h> which broke some stuff on X86

Change-Id: Ib71a6e548189ca2eacfd0caa7dbd17d200efd0ea