Changes

UMA: add missing include path

If make decides to build OMR_VM.o for omr_static_lib, it will not be
able to find mminitcore.h because $(top_srcdir)/gc/startup is not
on the include path (like it is in omr/makefile).

Signed-off-by: Keith W. Campbell <keithc@ca.ibm.com>
 (commit: 8acd2cd)