Ensure __MACH__ (macOS) systems have relevant defines set

Author: willend

mccode/src/port.h.in

@@ -20,13 +20,23 @@
 *
 *******************************************************************************/
 
-/* Macintosh specific compiler defines. */
+/* !!OLD!! Macintosh specific compiler defines. */
 #ifdef __dest_os
 #if (__dest_os == __mac_os)
 #define MAC
 #endif
 #endif
 
+/* Modern macOS defines */
+#ifdef __MACH__
+#ifndef HAVE_STRCASECMP
+#define HAVE_STRCASECMP HAVE_STRCASECMP
+#endif
+#ifndef HAVE_STRCASESTR
+#define HAVE_STRCASESTR HAVE_STRCASESTR
+#endif
+#endif
+
 /* File system details. */
 #ifndef MC_PATHSEP_C
 #ifdef WIN32