FindFreeType: also set `FREETYPE_FOUND`

Fixes: #25371

Modules/FindFreetype.cmake

@@ -144,6 +144,7 @@ if (freetype_FOUND)
     "${_Freetype_location}")
   unset(_Freetype_location)
   set(Freetype_FOUND 1)
+  set(FREETYPE_FOUND 1)
   set(FREETYPE_VERSION_STRING "${freetype_VERSION}")
   foreach (_Freetype_component IN LISTS Freetype_FIND_COMPONENTS)
     set(Freetype_${_Freetype_component}_FOUND "${freetype_${_Freetype_component}_FOUND}")