Try to fix CI script by building Neko from source, since binary appears to be the wrong architecture

.travis.yml

@@ -6,13 +6,11 @@ env:
   - secure: DXYUyMpbecZVlLUHHSrTFyUeaOor2hBIktXgv2AnwbzTgiJeFshUbWA0hu2j3pnGDNlJJpmrdyKJPTsT1hGFZ9tLm5J6Q8j4wA04GBp+dJl0+7RBs/R767XcyIRkJNw4a1hZJCQgv++wWvJ4GhW/KM1uUUHL5dh+McfNBz6SXLs=
   - secure: f0ps0Vor8x1p6rdzpAP67o6HkMIO2e3qFUiYIj+QJXkdzmmy7V3UHW3NxkOerzsiVkxksmB2MOocRCVlseWP72i/4qPrw/r8BpkmkO1SY/HdR1yv0g0DHwJw8i/zhRF390dvNQh/HR0SZrAeDQvKapwzkvQkUvwwp51O5xBLMbs=
 before_install:
-- wget -c http://nekovm.org/_media/neko-2.0.0-osx.tar.gz
-- sudo mkdir /usr/lib/neko
-- sudo tar xvzf neko-2.0.0-osx.tar.gz -C /usr/lib/neko --strip-components=1
-- sudo ln -s /usr/lib/neko/neko /usr/bin/neko
-- sudo ln -s /usr/lib/neko/nekoc /usr/bin/nekoc
-- sudo ln -s /usr/lib/neko/nekotools /usr/bin/nekotools
-- sudo ln -s /usr/lib/neko/libneko.dylib /usr/lib/libneko.dylib
+- git clone https://github.com/HaxeFoundation/neko.git neko --depth 1
+- cd neko
+- make os=osx
+- sudo make os=osx install
+- cd ..
 - wget -c http://haxe.org/file/haxe-3.1.2-osx.tar.gz
 - sudo mkdir /usr/lib/haxe
 - sudo tar xvzf haxe-3.1.2-osx.tar.gz -C /usr/lib/haxe --strip-components=1