Use --build-id=none to avoid build-id sections on FC8.

These build-id sections cause the Pintos ELF loader to reject
binaries.  The preferred way to eliminate them would be to add
	/DISCARD/ : { *(.note.gnu.build-id) }
to the linker script, but (as reported by Godmar Back) this causes a
segmentation fault in ld, as reported in a bug filed at:
	http://sourceware.org/bugzilla/show_bug.cgi?id=5025