[PATCH] build-sys: prevent warning about .depend when running make

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This is the typical warning:
  $ make clean >/dev/null
  Makefile:200: .depend: No such file or directory

It happens because there is no rule to build .depend before executing
the make action.

Ignoring errors when including generated dependency information seems to
be the norm in Makefiles, so we might as well do it here.

Tested:
- Checked that the warning is gone with the patch:
  $ make clean >/dev/null
  (empty)
- Built libnuma and ran make test_numademo, confirmed it works.

Signed-off-by: Filipe Brandenburger <filbranden@xxxxxxxxxx>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index fe42638fbca4..53191af58f8f 100644
--- a/Makefile
+++ b/Makefile
@@ -197,7 +197,7 @@ depend: .depend
 .depend:
 	${CC} -MM -DDEPS_RUN -I. ${SOURCES} > .depend.X && mv .depend.X .depend
 
-include .depend
+-include .depend
 
 Makefile: .depend
 
-- 
2.0.0.526.g5318336

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