[PATCH] tools/vm: allow users to provide additional cflags/ldflags

["Herton R. Krzesinski" <herton@redhat.com>]

Right now there is no way to provide additional cflags/ldflags when
building tools/vm binaries. And using eg. make CFLAGS=<options> will
override the CFLAGS being set in the Makefile, making the build fail
since it requires the include of the ../lib dir (for libapi).

This change then allows you to specify:
CFLAGS=<options> LDFLAGS=<options> make V=1 -C tools/vm

And the options will be correctly appended as can be seen from the
make output.

Signed-off-by: Herton R. Krzesinski <herton@redhat.com>
---
 tools/vm/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/vm/Makefile b/tools/vm/Makefile
index 9860622cbb15..6c1da51f4177 100644
--- a/tools/vm/Makefile
+++ b/tools/vm/Makefile
@@ -8,8 +8,8 @@ TARGETS=page-types slabinfo page_owner_sort
 LIB_DIR = ../lib/api
 LIBS = $(LIB_DIR)/libapi.a
 
-CFLAGS = -Wall -Wextra -I../lib/
-LDFLAGS = $(LIBS)
+CFLAGS += -Wall -Wextra -I../lib/
+LDFLAGS += $(LIBS)
 
 all: $(TARGETS)
 
-- 
2.38.1