message: Add CC=clang to mongo-c-driver
diff: @@ -23,7 +23,7 @@ before_install:
  - cd $TRAVIS_BUILD_DIR/ext && wget https://cmake.org/files/v3.9/cmake-3.9.0-Linux-x86_64.tar.gz && tar xzf cmake-3.9.0-Linux-x86_64.tar.gz
  - cd $TRAVIS_BUILD_DIR/ext && git clone --depth=1 --single-branch git://github.com/oci-labs/clang-WebAssembly wasm-compiler
  - cd $TRAVIS_BUILD_DIR/ext && wget https://github.com/mongodb/mongo-c-driver/releases/download/1.8.0/mongo-c-driver-1.8.0.tar.gz && tar xzf mongo-c-driver-1.8.0.tar.gz
  - - cd mongo-c-driver-1.8.0 && ./configure --disable-automatic-init-and-cleanup --enable-static && make && sudo make install
  + - cd mongo-c-driver-1.8.0 && ./configure --disable-automatic-init-and-cleanup --enable-static CC=clang-4.0 && make && sudo make install
  - cd $TRAVIS_BUILD_DIR/ext && git clone https://github.com/mongodb/mongo-cxx-driver.git --branch releases/stable --depth 1
  - cd mongo-cxx-driver/build && cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local .. && sudo make EP_mnmlstc_core && make && sudo make install
  - cd $TRAVIS_BUILD_DIR
  