tests: don't expect msys2 llvm cmake tests to skip with llvm 18

They were skipped with llvm 17 based on the version, and they are
now no longer skipped with v18 and also pass now.

This depends on #12964 for llvm 18 support in meson.

(cherry picked from commit 80e1d28)

test cases/frameworks/15 llvm/test.json

@@ -3,8 +3,8 @@
     "options": {
       "method": [
         { "val": "config-tool", "skip_on_jobname": ["msys2-gcc"] },
-        { "val": "cmake", "skip_on_jobname": ["msys2"] },
-        { "val": "combination", "skip_on_jobname": ["msys2"] }
+        { "val": "cmake", "skip_on_jobname": ["msys2-gcc"] },
+        { "val": "combination", "skip_on_jobname": ["msys2-gcc"] }
       ],
       "link-static": [
         { "val": true, "skip_on_jobname": ["arch", "opensuse", "linux-gentoo-gcc"] },