remove macos support. Lennart will add it himself

Author: Rewbert

src/runtime/unix/config.h

@@ -86,10 +86,10 @@
 
 /*
  * Enable non-blocking IO polling.
- * Linux uses epoll; macOS uses kqueue (not yet implemented).
+ * Linux uses epoll
  * The backend is selected in unix/io_poll_impl.c.
  */
-#if defined(__linux__) || (defined(__APPLE__) && defined(__MACH__))
+#if defined(__linux__)
 #define MHS_IO_POLL 1
 #else
 #define MHS_IO_POLL 0

src/runtime/unix/io_poll_impl.c

@@ -3,13 +3,11 @@
  */
 
 /*
- * Selects the platform-specific IO poll backend for Unix targets.
+ * IO poll backend for Unix.
+ *
+ * Currently Linux only, using epoll. When a second implementation for MACOS is
+ * available, do some tricks here to dispatch the correct one.
+ *
  */
 
-#if defined(__linux__)
 #include "io_poll_epoll.c"
-#elif defined(__APPLE__) && defined(__MACH__)
-#include "io_poll_kqueue.c"
-#else
-#error "No IO poll backend available for this platform"
-#endif