Change order of checks to use Build.PL before Makefile.PL, since some may have both.
Change order of checks to use Build.PL before Makefile.PL, since some may have both.

frol/conda-build,shastings517/conda-build,ilastik/conda-build,dan-blanchard/conda-build,frol/conda-build,mwcraig/conda-build,frol/conda-build,shastings517/conda-build,sandhujasmine/conda-build,takluyver/conda-build,sandhujasmine/conda-build,ilastik/conda-build,dan-blanchard/conda-build,sandhujasmine/conda-build,takluyver/conda-build,mwcraig/conda-build,mwcraig/conda-build,ilastik/conda-build,rmcgibbo/conda-build,rmcgibbo/conda-build,shastings517/conda-build,takluyver/conda-build,dan-blanchard/conda-build,rmcgibbo/conda-build