Make git_oid_equal a non-inline API

include/git2/oid.h

@@ -167,10 +167,7 @@ GIT_EXTERN(int) git_oid_cmp(const git_oid *a, const git_oid *b);
  * @param b second oid structure.
  * @return true if equal, false otherwise
  */
-GIT_INLINE(int) git_oid_equal(const git_oid *a, const git_oid *b)
-{
-	return !git_oid_cmp(a, b);
-}
+GIT_EXTERN(int) git_oid_equal(const git_oid *a, const git_oid *b);
 
 /**
  * Compare the first 'len' hexadecimal characters (packets of 4 bits)

src/oid.c

@@ -179,6 +179,11 @@ int git_oid_cmp(const git_oid *a, const git_oid *b)
 	return git_oid__cmp(a, b);
 }
 
+int git_oid_equal(const git_oid *a, const git_oid *b)
+{
+	return (git_oid__cmp(a, b) == 0);
+}
+
 int git_oid_ncmp(const git_oid *oid_a, const git_oid *oid_b, size_t len)
 {
 	const unsigned char *a = oid_a->id;