comment out only the purpose part of mesalink in travis

.travis.yml

@@ -27,7 +27,7 @@ install:
 - sudo apt-get install -qq realpath libgflags-dev libprotobuf-dev libprotoc-dev protobuf-compiler libleveldb-dev libgoogle-perftools-dev libboost-dev libssl-dev libevent-dev libboost-test-dev
 - sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo env "PATH=$PATH" cmake . && sudo make && sudo mv libgtest* /usr/lib/ && cd -
 - sudo apt-get install -y gdb  # install gdb
-#- if [[  "$USE_MESALINK" == "yes" ]]; then curl https://sh.rustup.rs -sSf | sh -s -- -y && source $HOME/.cargo/env && wget https://github.com/mesalock-linux/mesalink/archive/v0.8.0.tar.gz && tar -xf v0.8.0.tar.gz && cd mesalink-0.8.0 && ./autogen.sh --prefix=/usr/  && make && sudo make install && cd - ; fi
+- if [[  "$USE_MESALINK" == "yes" ]]; then curl https://sh.rustup.rs -sSf | sh -s -- -y && source $HOME/.cargo/env && wget https://github.com/mesalock-linux/mesalink/archive/v0.8.0.tar.gz && tar -xf v0.8.0.tar.gz && cd mesalink-0.8.0 && ./autogen.sh --prefix=/usr/  && make && sudo make install && cd - ; fi
 
 script:
 - sh build_in_travis_ci.sh

build_in_travis_ci.sh

@@ -23,9 +23,9 @@ echo "build combination: PURPOSE=$PURPOSE CXX=$CXX CC=$CC"
 
 init_make_config() {
 EXTRA_BUILD_OPTS=""
-#if [ "$USE_MESALINK" = "yes" ]; then
-#    EXTRA_BUILD_OPTS="$EXTRA_BUILD_OPTS --with-mesalink"
-#fi
+if [ "$USE_MESALINK" = "yes" ]; then
+    EXTRA_BUILD_OPTS="$EXTRA_BUILD_OPTS --with-mesalink"
+fi
 
 # The default env in travis-ci is Ubuntu.
 if ! sh config_brpc.sh --headers=/usr/include --libs=/usr/lib --nodebugsymbols --cxx=$CXX --cc=$CC $EXTRA_BUILD_OPTS --with-thrift ; then