wasm: Add warning and error when using not recommended emscripten

This will produce an error when configuring Qt with Emscripten
version less than what is recommended version.
It will produce only a warning when configuring using
Emscripten version greater than recommended.

Change-Id: I62016394e8e52657a5e1d78c4288866e83af2d28
Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io>
Reviewed-by: Even Oscar Andersen <even.oscar.andersen@qt.io>

configure.cmake

@@ -1460,9 +1460,15 @@ qt_configure_add_report_entry(
     CONDITION QT_FEATURE_thread AND WASM
 )
 qt_configure_add_report_entry(
-    TYPE WARNING
+    TYPE ERROR
     MESSAGE "You should use the recommended Emscripten version ${QT_EMCC_RECOMMENDED_VERSION} with this Qt. You have ${EMCC_VERSION}."
-    CONDITION WASM AND NOT ${EMCC_VERSION} MATCHES ${QT_EMCC_RECOMMENDED_VERSION}
+    CONDITION WASM AND ${EMCC_VERSION} VERSION_LESS ${QT_EMCC_RECOMMENDED_VERSION}
+)
+qt_configure_add_report_entry(
+    TYPE WARNING
+    MESSAGE "Using Emscripten version ${QT_EMCC_RECOMMENDED_VERSION} with this Qt
+    may have issues. You have ${EMCC_VERSION}."
+    CONDITION WASM AND ${EMCC_VERSION} VERSION_GREATER ${QT_EMCC_RECOMMENDED_VERSION}
 )
 qt_configure_add_report_entry(
     TYPE WARNING