feature: add ohos build

Change-Id: I297770ae07d71987c74b18c475f28b1c5d734ce7

meson_options.txt

@@ -23,7 +23,7 @@ option(
   type : 'array',
   value : ['auto'],
   choices : [
-    'auto', 'x11', 'wayland', 'haiku', 'android', 'windows',
+    'auto', 'x11', 'wayland', 'haiku', 'android', 'windows', 'ohos',
   ],
   description : 'window systems to support. If this is set to `auto`, all platforms applicable will be enabled.'
 )
@@ -33,7 +33,7 @@ option(
   value : 'auto',
   choices : [
     'auto', 'x11', 'wayland', 'haiku', 'android', 'windows',
-    'surfaceless', 'drm',
+    'surfaceless', 'drm', 'ohos',
   ],
   description : 'the window system EGL assumes for EGL_DEFAULT_DISPLAY',
 )