tests: Compile with -i inc instead of #including by direct path

#include "png.bi" runs the risk of #including fbc's png.bi, instead of
ours, but doing #include "../inc/png.bi" doesn't fully fix the issue,
because our png.bi may have other #includes which may be end up being
found in fbc's inc directory. To handle those we need to specify our own
inc directory. Ideally fbc would have something like -nodefincdir too...
tests: clang
raw: clang: Add clang-c/Platform.bi
Merge branch 'raw'
raw: clang: Combine headers into single clang-c.bi
raw: llvm 3.5.0
Merge branch 'raw'

Conflicts:
	makefile
llvm: Make the llvm-config.h part less linux-x86-specific
tests: llvm
tests: Fix clang test
tests: Fix llvm test
llvm: Fix bool typedef
llvm: Fix #includes
raw: llvm: Regenerate with fbfrog 50a51d71 (bool handling)
Merge branch 'raw'
iup: Fix permissions on directories of extracted tarball
Merge branch 'raw'
tests: iup
tests: Add separate test for IUP LUA stuff
iup: Fix forward decl