Port yuzu commit: "yuzu/CMakeLists: Disable implicit QString co… (#5074)

* yuzu/CMakeLists: Disable implicit QString conversions

Now that all of our code is compilable with implicit QString
conversions, we can enforce it at compile-time by disabling them.

Co-Authored-By: Mat M. <lioncash@users.noreply.github.com>

* citra_qt: Remove lots of implicit QString conversions

Co-authored-by: Mat M. <mathew1800@gmail.com>

src/citra_qt/CMakeLists.txt

@@ -244,6 +244,10 @@ target_compile_definitions(citra-qt PRIVATE
 
     # Disable implicit QString->QUrl conversions to enforce use of proper resolving functions.
     -DQT_NO_URL_CAST_FROM_STRING
+
+    # Disable implicit conversions from/to C strings
+    -DQT_NO_CAST_FROM_ASCII
+    -DQT_NO_CAST_TO_ASCII
 )
 
 if (CITRA_ENABLE_COMPATIBILITY_REPORTING)