mingw: remove 'make check' steps.
mingw: remove 'make check' steps.

This requires wine to run the windows executables, which is a
pretty heavy dependency. Better to do without for now.

SmartWalkieOrg/opusfile,xiph/opusfile,xiph/opusfile,SmartWalkieOrg/opusfile,SmartWalkieOrg/opusfile,xiph/opusfile