Use prepackaged cmocka instead of building custom version

Author: Ondřej Surý

.travis.yml

@@ -1,7 +1,4 @@
 language: c
-env:
-  global:
-  - CMOCKA_VERSION: 1.1.5
 
 cache:
   pip: true
@@ -55,6 +52,7 @@ addons:
     - w3m
     - curl
     - valgrind
+    - libcmocka-dev
     - libpcre3-dev
     - python3-dev
     - python3-cffi
@@ -65,15 +63,10 @@ addons:
   homebrew:
     packages:
     - curl
+    - cmocka
     update: true
 
 before_install:
-  - OLD_CMOCKA_VERSION=$(sed -n 's/project(cmocka VERSION \([0-9.]*\) LANGUAGES C)/\1/p' cmocka/CMakeLists.txt)
-  - if [ -f "cmocka/CMakeLists.txt" ] && [ "$OLD_CMOCKA_VERSION" != "$CMOCKA_VERSION" ]; then echo "Purging the cmocka-$OLD_CMOCKA_VERSION from cache"; rm -rf cmocka; fi
-  - if [ ! -d "cmocka" ] || [ ! -f "cmocka/CMakeLists.txt" ]; then echo "Downloading cmocka-$CMOCKA_VERSION"; rm -rf cmocka && curl -SLO https://cmocka.org/files/1.1/cmocka-$CMOCKA_VERSION.tar.xz && tar -xJf cmocka-$CMOCKA_VERSION.tar.xz && mv "cmocka-$CMOCKA_VERSION" cmocka; fi
-  - if [ ! -d "cmocka/build" ] || [ ! -f "cmocka/build/Makefile" ]; then mkdir -p cmocka/build && (cd cmocka/build && cmake ..); fi
-  - if [ "$TRAVIS_OS_NAME" = "osx" ] && [ ! -f "cmocka/build/src/libcmocka.dylib" ]; then (cd cmocka/build && make -j2); fi
-  - if [ "$TRAVIS_OS_NAME" = "linux" ] && [ ! -f "cmocka/build/src/libcmocka.so" ]; then (cd cmocka/build && make -j2); fi
   - if [ "$DEPLOY_BUILD" = "TRUE" ]; then sudo snap install universal-ctags; fi
   - if [ "$DEPLOY_BUILD" = "TRUE" ]; then pip3 install --user codecov==2.0.22; export CFLAGS="-coverage"; fi