diff: move diff.c to diff-lib.c to make room.

Now I am not doing any real "git-diff in C" yet, but this would
help before doing so.

Signed-off-by: Junio C Hamano <junkio@cox.net>

2 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 8aed3af016..3ecd674c14 100644
--- a/Makefile
+++ b/Makefile
@@ -199,7 +199,7 @@ LIB_H = \
 	tree-walk.h log-tree.h
 
 DIFF_OBJS = \
-	diff.o diffcore-break.o diffcore-order.o \
+	diff-lib.o diffcore-break.o diffcore-order.o \
 	diffcore-pickaxe.o diffcore-rename.o tree-diff.o combine-diff.o \
 	diffcore-delta.o log-tree.o
 
diff --git a/diff.c b/diff-lib.c
index 0a832c3585..0a832c3585 100644
--- a/diff.c
+++ b/diff-lib.c