wt-status.h: declare global variables as extern

There are linkers out there that complain if a global non-static variable
is defined multiple times.

Signed-off-by: Johannes Sixt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Johannes Sixt

wt-status.h

@@ -28,8 +28,8 @@ struct wt_status {
 };
 
 int git_status_config(const char *var, const char *value);
-int wt_status_use_color;
-int wt_status_relative_paths;
+extern int wt_status_use_color;
+extern int wt_status_relative_paths;
 void wt_status_prepare(struct wt_status *s);
 void wt_status_print(struct wt_status *s);