github: remove gcc and meson jobs

Author: rscharfe

.github/workflows/main.yml

@@ -120,12 +120,6 @@ jobs:
           - jobname: osx-reftable
             cc: clang
             pool: macos-14
-          - jobname: osx-gcc
-            cc: gcc-13
-            pool: macos-14
-          - jobname: osx-meson
-            cc: clang
-            pool: macos-14
     env:
       CC: ${{matrix.vector.cc}}
       CC_PACKAGE: ${{matrix.vector.cc_package}}