bootstrap: Convert MSYS paths to Windows format (#13001)

We set CMAKE_PREFIX_PATH from the --prefix= option.  The calling shell
might not translate "/c/..." to "c:/..." paths but we need to store
Windows paths in CMake cache variables.  Pass the specified path through
the MSYS shell in a form it will convert to a Windows path using the
MSYS fstab.

Some MSYS bash implementations leave trailing space on the command line
to 'cmd /c echo ...' after quoting the message.  The Windows echo tool
preserves both the quotes and the trailing space.  Use a sed expression
that strips quotes and trailing spaces after the end quote.

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