Disable broken asm test on Cygwin as nobody knows how to fix it.

test cases/common/128 generated assembly/meson.build

@@ -2,6 +2,10 @@ project('generated assembly', 'c')
 
 cc = meson.get_compiler('c')
 
+if build_machine.system() == 'cygwin'
+  error('MESON_SKIP_TEST: Cygwin is broken and nobody knows how to fix it. Patches welcome.')
+endif
+
 if ['msvc', 'clang-cl', 'intel-cl'].contains(cc.get_id())
   error('MESON_SKIP_TEST: assembly files cannot be compiled directly by the compiler')
 endif