Fix included headers

Author: mtrojnar

examples/listkeys_ext.c

@@ -39,6 +39,7 @@
 #define _POSIX_C_SOURCE 200809L
 #include <stdio.h>
 #include <unistd.h>
+#include <string.h>
 #include <libp11.h>
 
 #define RANDOM_SOURCE "/dev/urandom"

src/util_uri.c

@@ -28,10 +28,11 @@
 
 #include "util.h"
 #include <stdio.h>
-#include <strings.h>
 
 #if defined(_WIN32) || defined(_WIN64)
 #define strncasecmp _strnicmp
+#else
+#include <strings.h>
 #endif
 
 /* switch to legacy call if get0 variant is not available */