Re-add compat.h to two files for Windows.

Closes #167.
diff --git a/src/zipcmp.c b/src/zipcmp.c
index 8ddf41d..a79c650 100644
--- a/src/zipcmp.c
+++ b/src/zipcmp.c
@@ -53,6 +53,8 @@
 
 #include "zip.h"
 
+#include "compat.h"
+
 struct archive {
     const char *name;
     zip_t *za;
diff --git a/src/ziptool.c b/src/ziptool.c
index 6100e9d..cb3d27f 100644
--- a/src/ziptool.c
+++ b/src/ziptool.c
@@ -55,6 +55,8 @@
 
 #include "zip.h"
 
+#include "compat.h"
+
 typedef struct dispatch_table_s {
     const char *cmdline_name;
     int argument_count;