Add support for N jobs when invoking ndk-build. Improves compile times. Buddy: Scott M
Add support for N jobs when invoking ndk-build. Improves compile times. Buddy: Scott M

wrld3d/wrld-example-app,wrld3d/wrld-example-app,wrld3d/wrld-example-app,eegeo/eegeo-example-app,eegeo/eegeo-example-app,eegeo/eegeo-example-app,wrld3d/wrld-example-app,eegeo/eegeo-example-app,wrld3d/wrld-example-app,eegeo/eegeo-example-app,wrld3d/wrld-example-app,wrld3d/wrld-example-app,eegeo/eegeo-example-app,wrld3d/wrld-example-app,eegeo/eegeo-example-app