ui-diff.c: create a control panel for diff options

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

ui-diff.h

@@ -1,11 +1,13 @@
 #ifndef UI_DIFF_H
 #define UI_DIFF_H
 
+extern void cgit_print_diff_ctrls();
+
 extern void cgit_print_diffstat(const unsigned char *old_sha1,
 				const unsigned char *new_sha1);
 
 extern void cgit_print_diff(const char *new_hex, const char *old_hex,
-			    const char *prefix);
+			    const char *prefix, int show_ctrls);
 
 extern struct diff_filespec *cgit_get_current_old_file(void);
 extern struct diff_filespec *cgit_get_current_new_file(void);