Include compat.h for PRI* defines on Windows.

From Boaz Stolk.
diff --git a/regress/modify.c b/regress/modify.c
index 3a698b2..b4fde7e 100644
--- a/regress/modify.c
+++ b/regress/modify.c
@@ -51,6 +51,7 @@
 #endif
 
 #include "zip.h"
+#include "compat.h"
 
 zip_source_t *source_hole_create(const char *, int flags, zip_error_t *);