Fix build using -std=c99
In each place where POSIX/GNU functions are used, the file must declare
that it wants POSIX functionality before including any system headers.
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index f82694a..8f04885 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -36,6 +36,7 @@
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
#include <unistd.h>
+#include <strings.h>
#endif
/*----------------------------------------------------------------------------*/