Why are the python reasons for having our code nested in a directory
called ``swift_build_support.swift_build_support/`` instead of simply
``swift_build_support/``? Is that what we really want here?
- This improves the error messages when commands fail (or don't exist) to show
a one-line summary of the issue instead of the Python backtrace, and matches
what was being done by the matching function in `SwiftBuildSupport`.
* E101: indentation contains mixed spaces and tabs
* E111: indentation is not a multiple of four
* E128: continuation line under-indented for visual indent
* E302: expected 2 blank lines, found 1
* W191: indentation contains tabs
Rather than archiving symbols at the very end of the build-script-impl
shellscript, do so at the end of the Python build-script. A small step towards
achieving SR-237.
