fix: change FindICU to properly check pkg-config results

While skiping this checks for Android. Idealy it would also be done in
Android, something to improve a in future release.

cmake/FindICU.cmake

@@ -42,13 +42,14 @@ foreach(MOD_NAME IN LISTS ICU_FIND_COMPONENTS)
     # Check the libraries returned by pkg-config really exist.
     unset(PC_LIBRARIES)
     foreach(LIBRARY IN LISTS PC_ICU_${MOD_NAME}_LIBRARIES)
+        unset(PC_LIBRARY CACHE)
         if(NOT PC_ICU_${MOD_NAME}_LIBRARY)
-            find_library(PC_ICU_${MOD_NAME}_LIBRARY NAMES ${LIBRARY})
+            find_library(PC_LIBRARY NAMES ${LIBRARY})
         endif()
         if(NOT PC_ICU_${MOD_NAME}_LIBRARY)
             unset(PC_ICU_${MOD_NAME}_FOUND)
         endif()
-        list(APPEND PC_LIBRARIES ${PC_ICU_${MOD_NAME}_LIBRARY})
+        list(APPEND PC_LIBRARIES ${PC_LIBRARY})
     endforeach()
     unset(PC_LIBRARY CACHE)