Fixed Make build configuration to work on OSX.

.travis.yml

@@ -34,6 +34,7 @@ install:
 
 script:
   - if [ "$TRAVIS_OS_NAME" = "linux" ]; then PREMAKE=build/premake5-linux-64; else PREMAKE=build/premake5-osx; fi
+  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then BUILD_CONF=release_x64; else BUILD_CONF=release_x32; fi
   - $PREMAKE --file=build/premake4.lua gmake
-  - config=release_x64 make -C build/gmake/
-  - for test in build/gmake/lib/Release_x64/*.Tests.*.dll; do MONO_PATH=deps/NUnit.Runners.2.6.4/tools mono deps/NUnit.Runners.2.6.4/tools/nunit-console.exe $test; done
+  - config=$BUILD_CONF make -C build/gmake/
+  - for test in build/gmake/lib/Release_*/*.Tests.*.dll; do MONO_PATH=deps/NUnit.Runners.2.6.4/tools mono deps/NUnit.Runners.2.6.4/tools/nunit-console.exe $test; done