Remove ignored commands from gcc12 CI

Author: GuillaumeGomez

.github/workflows/gcc12.yml

@@ -28,9 +28,6 @@ jobs:
           # FIXME: re-enable asm tests when GCC can emit in the right syntax.
           # "--asm-tests",
           "--test-libcore",
-          "--extended-rand-tests",
-          "--extended-regex-example-tests",
-          "--extended-regex-tests",
           "--test-successful-rustc --nb-parts 2 --current-part 0",
           "--test-successful-rustc --nb-parts 2 --current-part 1",
         ]