Go back using gcc 7

.travis.yml

@@ -8,30 +8,22 @@ jobs:
   - os:   linux
     arch: amd64
     dist: bionic
-    env:  MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"
     addons:
       apt:
         sources:
         - sourceline: 'ppa:ubuntu-toolchain-r/test'
 
         packages:
-        - gcc-8
-        - g++-8
         - doxygen
 
   - os:   linux
     arch: arm64
     dist: bionic
-    env:  MATRIX_EVAL="CC=gcc-8 && CXX=g++-8"
     addons:
       apt:
         sources:
         - sourceline: 'ppa:ubuntu-toolchain-r/test'
 
-        packages:
-        - gcc-8
-        - g++-8
-
   - os: osx
     osx_image: xcode10.1
 

.travis/install.sh

@@ -4,7 +4,5 @@ set -ex
 
 if [[ ${TRAVIS_OS_NAME} == "linux" ]]; then
   sudo apt-get install libasound2-dev libjack-jackd2-dev libsndfile1-dev lv2-dev
-
-  sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-8 100
   gcc -v && g++ -v && cmake --version && /usr/local/bin/cmake --version && $SHELL --version
 fi