system.h: use <usual/ctype.h> instead ctype directly.

Fixes problems with signed chars.

diff --git a/include/system.h b/include/system.h
index de3702a883501390f9032600df4a8bdfc0a83a68..ed8c7d4dbe44f34a7522dde7826821c1a646bcf0 100644 (file)
--- a/include/system.h
+++ b/include/system.h
@@ -21,6 +21,7 @@
  */
 
 #include <usual/base.h>
+#include <usual/ctype.h>
 
 #ifdef WIN32
 #include "win32support.h"
@@ -29,7 +30,6 @@
 #include <sys/stat.h>
 
 #include <stdarg.h>
-#include <ctype.h>
 #include <limits.h>
 
 #ifdef HAVE_CRYPT_H