Install deps on the fly

This reverts commit 36704d5dad.

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 defaults: &defaults
   working_directory: ~/ddnet/ddnet
   docker:
-    - image: learath2/ddnet-env:v1
+    - image: buildpack-deps:stretch
 
 jobs:
   pre_test:
@@ -24,6 +24,21 @@ jobs:
       #- run: mkdir -p $CIRCLE_ARTIFACTS $CIRCLE_TEST_REPORTS
       - run: git submodule update --init
 
+      - run: |
+          apt-get update
+          apt-get install -y build-essential \
+            python3 \
+            libcurl4-openssl-dev \
+            libfreetype6-dev \
+            libsdl2-dev \
+            libglew-dev \
+            libogg-dev \
+            libopus-dev \
+            libpnglite-dev \
+            libopusfile-dev \
+            libwavpack-dev
+          apt-get install -y cmake xz-utils
+
       # Compile
       - run: python scripts/check_header_guards.py
       - run: |
@@ -42,6 +57,10 @@ jobs:
       - attach-workspace:
           at: ./
 
+      - run: |
+          apt-get update
+          apt-get install -y make cmake xz-utils
+
       - run: |
           cd build
           make run_tests