meson: fix support of coreaudio on ios

Change-Id: Ib5505badbef60a8c0832495589728de298f83607

src/meson.build

@@ -176,6 +176,14 @@ if conf.get('HAVE_PORTAUDIO') == 1
 endif
 
 if conf.get('HAVE_COREAUDIO') == 1
+    if meson.get_compiler('cpp').compiles('''#import <TargetConditionals.h>
+                                             #if TARGET_OS_IPHONE == 0
+                                             #error This is not an IPHONE
+                                             #endif''')
+        libjami_sources += files(
+            'media/audio/coreaudio/ios/corelayer.mm'
+        )
+    else
         libjami_sources += files(
             'media/audio/coreaudio/osx/audiodevice.cpp',
             'media/audio/coreaudio/osx/corelayer.cpp'