Fix working directory for docker command

Author: Huang-Ming Huang

.travis/setenv.sh

@@ -1,14 +1,15 @@
 #!/bin/bash
 
 if [[ "$COMPILER" == "Emscripten" ]]; then
+  docker pull thewtex/cross-compiler-browser-asmjs
   CMAKE_TOOLCHAIN_FILE=`docker inspect --format='{{range .Config.Env}}{{println .}}{{end}}' thewtex/cross-compiler-browser-asmjs | grep CMAKE_TOOLCHAIN_FILE | sed 's/^.*=//'`
   export CONFIG_ARGS="-DBoost_INCLUDE_DIR=/usr/local/include -DCMAKE_TOOLCHAIN_FILE=$CMAKE_TOOLCHAIN_FILE"
   export RUN="docker run --rm \
                   -v $PWD:/mfast \
                   -v /usr/include/boost:/usr/local/include/boost \
                   -e AR= \
                   -e CXX= \
-                  -w /mfast \
+                  -w /mfast/build \
                   -t thewtex/cross-compiler-browser-asmjs "
 else
   export CONFIG_ARGS="-DCMAKE_CXX_COMPILER=$COMPILER"