Only package 4.8 gcc on linux

.decent_ci-Linux.yaml

@@ -18,6 +18,7 @@ compilers:
     cmake_extra_flags: -DBUILD_PACKAGE:BOOL=ON -DBUILD_TESTING:BOOL=ON -DBUILD_TESTING:BOOL=ON
   - name: "gcc"
     version: "4.6"
+    skip_packaging: true
     cmake_extra_flags: -DBUILD_SAMPLES:BOOL=ON -DBUILD_PACKAGE:BOOL=ON -DBUILD_TESTING:BOOL=ON
   - name: cppcheck
     compiler_extra_flags: --enable=all -I include --inline-suppr