Fix 2.4 travis (#8411)

.travis.yml

@@ -16,13 +16,14 @@ addons:
       - libmpc3
       - libfox-1.6-dev
       - libgtest-dev
+      - lib32stdc++6
+      - libclang-common-6.0-dev
       - clang-6.0
       - python3-pip
 
 env:
   global:
     - QT_BASE=57
-    - GCC_ARM_VERSION=4_7-2013q3
   matrix:
     - FLAVOR=COMPANION
     - FLAVOR=ARM9X
@@ -44,7 +45,7 @@ before_install:
   - sudo ln -s /opt/gcc-arm-none-eabi/bin/arm-none-eabi-size /usr/bin/arm-none-eabi-size
   - sudo apt-get install --yes --force-yes -qq qt${QT_BASE}base qt${QT_BASE}multimedia qt${QT_BASE}svg qt${QT_BASE}tools; source /opt/qt${QT_BASE}/bin/qt${QT_BASE}-env.sh
   - sudo ln -sf /usr/bin/python3 /usr/bin/python
-  - python3 -m pip install --upgrade pip
+  - python3 -m pip install pip==20.3.3
   - sudo apt-get install python3-setuptools
   - python3 -m pip install pillow clang