add {load,unset}_PKGBUILD to conf.sh, use it.

There are a bunch of caveats to loading a PKGBUILD file.  This way it is
all done correctly in one place.

unset_PKGBUILD unsets any functions and variables that are normally set in
a PKGBUILD.  The list is far more complete than any existing
implementation.

load_PKGBUILD loads the file given, or "./PKGBUILD" if none is given.  But
first it calls unset_PKGBUILD and then sets CARCH.

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