Make simulator compile on MacOS

Tested on MacOS Sequoia (Apple Silicon) with the
latest Xcode command line tools, gcc 14
(Homebrew GCC 14.2.0_1) and sdl2 (Homebrew 2.30.9)

Make sure 'gcc' (and 'gcc-ar') is in your PATH
ahead of the Xcode-provided "gcc"(clang). E.g.
by setting up symlinks in /usr/local/bin that
point to gcc-14 and gcc-ar-14.

Notes:
- The appropriate bmp from uisimulator/bitmaps
  has to be manually copied to your build folder
  and renamed to UI256.bmp, if you want the sim
  background to be displayed

Change-Id: I559f33d2165065f913f30c016b85906af380fb81

firmware/target/hosted/rtc.c

@@ -24,7 +24,9 @@
 #include <sys/time.h>
 #if !defined(WIN32)
 #include <sys/ioctl.h>
+#if !defined(__APPLE__)
 #include <linux/rtc.h>
+#endif
 #include <fcntl.h>
 #include <unistd.h>
 #include <stdbool.h>
@@ -47,7 +49,7 @@ int rtc_read_datetime(struct tm *tm)
 
 int rtc_write_datetime(const struct tm *tm)
 {
-#if !defined(WIN32)
+#if !defined(WIN32) && !defined(__APPLE__)
     struct timeval tv;
     struct tm *tm_time;