gcc: fix warnings (#156)

test/include/common.h

@@ -16,6 +16,10 @@
 #  define _CRT_SECURE_NO_WARNINGS /* for windows */
 #endif
 
+#ifndef _GNU_SOURCE
+#  define _GNU_SOURCE /* for drand48() */
+#endif
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>

test/runner.c

@@ -18,6 +18,8 @@ main(int argc, const char * argv[]) {
   test_status_t st;
   int32_t       i, count, passed, failed, maxlen;
   double        start, end, elapsed, total;
+  (void)argc;
+  (void)argv;
 
   passed = failed = maxlen  = 0;
   total  = 0.0;