Bugzilla bug #77788: CFLAGS should not be defined with +=.

security/coreconf/command.mk

@@ -42,7 +42,7 @@ CCF           = $(CC) $(CFLAGS)
 LINK_DLL      = $(LINK) $(OS_DLLFLAGS) $(DLLFLAGS)
 LINK_EXE      = $(LINK) $(OS_LFLAGS) $(LFLAGS)
 NFSPWD        = $(NSINSTALL_DIR)/nfspwd
-CFLAGS       += $(OPTIMIZER) $(OS_CFLAGS) $(XP_DEFINE) $(DEFINES) $(INCLUDES) \
+CFLAGS        = $(OPTIMIZER) $(OS_CFLAGS) $(XP_DEFINE) $(DEFINES) $(INCLUDES) \
 		$(XCFLAGS)
 RANLIB        = echo
 TAR           = /bin/tar