Fix an "implicit function definition" warning on cygwin

In particular, the warning relates to malloc(), which is
declared in <stdlib.h>.  This header is now included,
indirectly, via the "common.h" header.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/oid.c b/src/oid.c
index 5f3408511..bca03c4e4 100644
--- a/src/oid.c
+++ b/src/oid.c
@@ -23,6 +23,7 @@
  * Boston, MA 02110-1301, USA.
  */
 
+#include "common.h"
 #include "git/oid.h"
 #include <string.h>