meson: remove unnecessary coreaudio test program

AudioGetCurrentHostTime has been present forever, so the test is not
enforcing a specific version of macOS.  In fact the test was broken
since it was not linking against the coreaudio dependency; just remove it.

Fixes: 87430d5b13 ("configure, meson: move audio driver detection to Meson", 2021-10-14)
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

meson.build

@@ -944,22 +944,6 @@ coreaudio = not_found
 if not get_option('coreaudio').auto() or (targetos == 'darwin' and have_system)
   coreaudio = dependency('appleframeworks', modules: 'CoreAudio',
                          required: get_option('coreaudio'))
-  if coreaudio.found() and not cc.links('''
-    #include <CoreAudio/CoreAudio.h>
-    int main(void)
-    {
-      return (int)AudioGetCurrentHostTime();
-    }''')
-    coreaudio = not_found
-  endif
-
-  if not coreaudio.found()
-    if get_option('coreaudio').enabled()
-      error('CoreAudio not found')
-    else
-      warning('CoreAudio not found, disabling')
-    endif
-  endif
 endif
 
 opengl = not_found