Fix build against KDE Frameworks 5.83
(no longer ships find module, and the
cmake default one is used).

--- libs/text/CMakeLists.txt.orig	2021-07-09 21:32:19 UTC
+++ libs/text/CMakeLists.txt
@@ -152,11 +152,11 @@ if( SHOULD_BUILD_FEATURE_RDF )
 endif()
 
 if( FONTCONFIG_FOUND )
-    target_link_libraries(kotext PRIVATE ${FONTCONFIG_LIBRARIES})
+    target_link_libraries(kotext PRIVATE Fontconfig::Fontconfig)
 endif()
 
 if( FREETYPE_FOUND )
-    target_link_libraries(kotext PRIVATE ${FREETYPE_LIBRARIES})
+    target_link_libraries(kotext PRIVATE Freetype::Freetype)
 endif()