(#4) Try to build everything

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
       - name: install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -qq nasm libfreetype6-dev libgif-dev
+          sudo apt-get install -qq nasm libfreetype6-dev libgif-dev libcurl4-openssl-dev
       - uses: actions/cache@v1
         with:
           # TODO: centralize ffmpeg version in the build
@@ -23,7 +23,9 @@ jobs:
           cd ..
       - name: build vodus
         run: |
-          make -B vodus.release vodus.debug
+          make -B
+        CC: gcc
+        CXX: g++
 
   build-linux-gcc:
     runs-on: ubuntu-18.04