Merge pull request #20920 from jketema/feature-incorrect

C++: Remove incorrect tests

Author: jketema

cpp/ql/test/library-tests/attributes/deprecated_with_msg/deprecated_with_msg.expected

@@ -1,4 +1,2 @@
 | clang421.c:1:12:1:19 | clang421 | 0 |
 | clang450.c:1:12:1:19 | clang450 | 1 |
-| gcc421.c:1:12:1:17 | gcc421 | 0 |
-| gcc450.c:1:12:1:17 | gcc450 | 1 |