freetype2.wrap: Provide fallback for CMake dep as well

Add a freetype identifier in the 'provides' section so that the fallback will
kick in if FreeType is requested but was not found, and wrap mode is not
disabled.
diff --git a/subprojects/freetype2.wrap b/subprojects/freetype2.wrap
index cf8f307..43ab8fa 100644
--- a/subprojects/freetype2.wrap
+++ b/subprojects/freetype2.wrap
@@ -5,3 +5,4 @@
 
 [provide]
 freetype2 = freetype_dep
+freetype = freetype_dep