Cast parameters to instr, strstr

This code isn't apparently compiled on modern platforms, as when I tried
to force them to compile, I had to do this.

1 files changed, 1 insertions, 1 deletions

diff --git a/util.h b/util.h
index 7d06feaa03..df0c7ad348 100644
--- a/util.h
+++ b/util.h
@@ -248,7 +248,7 @@ returning NULL if not found.  The terminating NUL bytes are not compared.
 */
 
 
-#define instr(haystack, needle) strstr(haystack, needle)
+#define instr(haystack, needle) strstr((char *) haystack, (char *) needle)
 
 #ifdef HAS_MEMMEM
 #   define ninstr(big, bigend, little, lend)                                \