Another try at cross compilation on circle.

circle.yml

@@ -10,6 +10,7 @@ dependencies:
         - sudo apt-get -qq install cmake
         - sudo apt-get install -qq g++-4.8
         - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
+        - sudo apt-get install -qq gcc-mingw-w64 g++-mingw-w64 
         - sudo apt-get install -qq xorg-dev
         - sudo apt-get install ninja-build
         # Install megacmd
@@ -17,9 +18,6 @@ dependencies:
         - cd megacmd; make
         - sudo cp megacmd/megacmd /usr/local/bin
         - echo $megacmd > ~/.megacmd.json
-        # Install mingw-w64
-        - git clone https://github.com/mxe/mxe.git
-        - cd mxe; make MXE_TARGETS="x86_64-w64-mingw32" -j$(($(nproc)+1))
 
 database:
     override: