This should help prevent broken builds next time I'm messing with
assembler/compiler/linker flags...
Change-Id: I30f15a3ce3c3f3c60cad7bc59aaba9f42d792224
libthread_db depends on libc but since unresolved symbols were allowed
in the makefile this problem was never realized until gdbserver tried
to link with it, failing in the runtime.
Change-Id: If2ee319a2503c81abf3010829444f920c7c0c227