ci: Skip gir test on cygwin

test cases/frameworks/37 gir cpp/meson.build

@@ -5,6 +5,12 @@ if not gi.found()
   error('MESON_SKIP_TEST gobject-introspection not found.')
 endif
 
+if host_machine.system() == 'cygwin'
+  # FIXME: g-ir-scanner seems broken on cygwin:
+  # ERROR: can't resolve libraries to shared libraries: foo++
+  error('MESON_SKIP_TEST g-ir-scanner is broken on cygwin.')
+endif
+
 gnome = import('gnome')
 
 lib = library('foo++', 'foo.cpp')

test cases/frameworks/37 gir cpp/test.json

@@ -1,3 +1,3 @@
 {
-  "skip_on_jobname": ["azure", "macos", "msys2"]
+  "skip_on_jobname": ["azure", "macos", "msys2", "cygwin"]
 }