Xcode: a few more skips.

test cases/common/171 generator link whole/meson.build

@@ -1,5 +1,9 @@
 project('generator link_whole', 'c')
 
+if meson.backend() == 'xcode'
+    error('MESON_SKIP_TEST: whole-archive not supported in Xcode. Patches welcome.')
+endif
+
 cc = meson.get_compiler('c')
 if cc.get_id() == 'msvc'
   if cc.version().version_compare('<19')

test cases/common/173 identical target name in subproject flat layout/meson.build

@@ -1,5 +1,9 @@
 project('subproject targets', 'c')
 
+if meson.backend() == 'xcode'
+    error('MESON_SKIP_TEST: many targets with the same name not supported in Xcode. Patches welcome.')
+endif
+
 # Idea behind this test is to create targets with identical name
 # but different output files. We can do this by choosing different
 # name_prefix of libraries. Target id does not depend on name_prefix.