Fail early when android target does not include --sdk-path
Fail early when android target does not include --sdk-path

Change-Id: I07e7e63476a2e32e3aae123abdee8b7bbbdc6a8c

mwgoldsmith/libvpx,mwgoldsmith/vpx,ShiftMediaProject/libvpx,webmproject/libvpx,Topopiccione/libvpx,webmproject/libvpx,Topopiccione/libvpx,mwgoldsmith/libvpx,Topopiccione/libvpx,mwgoldsmith/libvpx,Topopiccione/libvpx,mwgoldsmith/vpx,mwgoldsmith/vpx,Topopiccione/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,Topopiccione/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,mwgoldsmith/vpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/vpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,webmproject/libvpx,mwgoldsmith/libvpx