rename common.mk to build.mk

This is to avoid confusion with the canonical common.mk file that is
a CrOS build system.

BUG=chromium-os:33327
TEST=`cros_run_unit_tests --board x86-alex -p vboot_reference` still works

Change-Id: I4b6719d58a4a8ab44b62c23c0e2c45b154374958
Reviewed-on: https://gerrit.chromium.org/gerrit/29578
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>

cgpt/Makefile

@@ -48,7 +48,7 @@ LIB_CGPT_CC_SRCS = \
 
 main: $(PROGNAME)
 
-include ../common.mk
+include ../build.mk
 
 LIB_CGPT_CC_OBJS = $(filter %.o, \
 	$(LIB_CGPT_CC_SRCS:%.c=${BUILD_ROOT}/%.o) \

firmware/Makefile

@@ -115,7 +115,7 @@ else
 test : $(FWLIB)
 endif
 
-include ../common.mk
+include ../build.mk
 
 $(FWLIB) : $(LIB_OBJS)
 	rm -f $@

host/Makefile

@@ -37,7 +37,7 @@ test : $(HOSTLIB)
 	$(CC) $(CFLAGS) $(INCLUDES) -o $(BUILD_ROOT)/a.out $(TESTDIR)/main.c \
 	$(HOSTLIB) -lcrypto
 
-include ../common.mk
+include ../build.mk
 
 $(HOSTLIB) : $(ALL_OBJS) $(FWLIB)
 	rm -rf $@ $(BUILD_ROOT)/.tmp