Use the placeholder prefix in text files rather than the build prefix
Use the placeholder prefix in text files rather than the build prefix

This maximizes backwards compatibility with older versions of conda, and makes
the built package a little cleaner (it won't have the person who built it's
username).

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