github_workflow: remove build for Ubuntu 16.04

.github/workflows/ccpp.yml

@@ -14,19 +14,6 @@ jobs:
           sudo apt update
           sudo apt install -y build-essential cmake libfftw3-dev libmbedtls-dev libpcsclite-dev libboost-program-options-dev libconfig++-dev libsctp-dev colordiff ninja-build valgrind
           mkdir build && cd build && cmake -DRF_FOUND=True -GNinja .. && ninja && ctest
-  x86_ubuntu16_build:
-    name: Build and test on x86 Ubuntu 16.04
-    strategy:
-        matrix:
-          compiler: [gcc, clang]
-    runs-on: ubuntu-16.04
-    steps:
-      - uses: actions/checkout@v1
-      - name: Build srsRAN on x86 Ubuntu 16.04
-        run: |
-          sudo apt update
-          sudo apt install -y build-essential cmake libfftw3-dev libmbedtls-dev libpcsclite-dev libboost-program-options-dev libconfig++-dev libsctp-dev colordiff ninja-build valgrind
-          mkdir build && cd build && cmake -DRF_FOUND=True -GNinja .. && ninja && ctest
           
   aarch64_ubuntu18_build:
     runs-on: ubuntu-18.04