Travis CI: use make to build

.travis.yml

@@ -44,12 +44,9 @@ addons:
  apt:
  packages:
  - clang-3.6
- - ninja-build
  - lcov
 
 before_install:
- # Install ninja on macOS.
- - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install ninja; fi
  - if [[ "$BUILD_NDK" == "ON" ]]; then
  git clone --depth=1 https://github.com/urho3d/android-ndk.git $HOME/android-ndk;
  export ANDROID_NDK=$HOME/android-ndk;
@@ -80,19 +77,17 @@ script:
  -DANDROID_NATIVE_API_LEVEL=android-9
  -DCMAKE_BUILD_TYPE=Release
  -DANDROID_ABI="armeabi-v7a with NEON"
- -DSHADERC_SKIP_TESTS=ON
- -GNinja ..;
+ -DSHADERC_SKIP_TESTS=ON ..;
  else
  cmake -DCMAKE_BUILD_TYPE=${SHADERC_BUILD_TYPE:-Debug}
- -DENABLE_CODE_COVERAGE=${SHADERC_CODE_COVERAGE:-OFF}
- -GNinja ..;
+ -DENABLE_CODE_COVERAGE=${SHADERC_CODE_COVERAGE:-OFF} ..;
  fi
- - ninja
  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
  export NPROC=`nproc`;
  else
  export NPROC=`sysctl -n hw.ncpu`;
  fi
+ - make -j${NPROC}
  - if [[ "$BUILD_NDK" != "ON" ]]; then ctest -j${NPROC} --output-on-failure; fi
 
 after_success: