ci: change periodic.yml to use cc in the ubuntu job.

.github/workflows/periodic.yml

@@ -5,22 +5,16 @@ on:
     - cron:  '31 1,12 * * *'
 
 jobs:
-  network-tests-ubuntu-tcc:
+  network-tests-ubuntu:
     runs-on: ubuntu-latest
-    env:
-      VFLAGS: -cc tcc
     steps:
     - uses: actions/checkout@v2
     - name: Install dependencies
       run: sudo apt-get install --quiet -y libssl-dev sqlite3 libsqlite3-dev 
     - name: Build v
-      run: echo $VFLAGS && make -j4 && ./v -cg -o v cmd/v
+      run: make -j4 && ./v -cg -o v cmd/v
     - name: Symlink V
       run:  sudo ./v symlink
-    - name: Symlink tcc where v can find it
-      run: |
-        sudo ln -s /var/tmp/tcc/bin/tcc /usr/local/bin/tcc
-        tcc -version
     - name: Run network tests
       run: ./v -d network test-fixed