Use bundled JsonCPP on linux builder

Author: ferdnyc

.gitlab-ci.yml

@@ -17,7 +17,7 @@ linux-builder:
     - export LIBOPENSHOT_AUDIO_DIR=$CI_PROJECT_DIR/build/install-x64
     - mkdir -p build; cd build;
     - mkdir -p install-x64/python;
-    - cmake -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -D"CMAKE_INSTALL_PREFIX:PATH=$CI_PROJECT_DIR/build/install-x64" -D"CMAKE_BUILD_TYPE:STRING=Release" ../
+    - cmake -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON -D"CMAKE_INSTALL_PREFIX:PATH=$CI_PROJECT_DIR/build/install-x64" -D"CMAKE_BUILD_TYPE:STRING=Release" -D"USE_SYSTEM_JSONCPP=0" ../
     - make
     - make install
     - make doc