Fix obscure crash with rsource and $srctree pointing to a symlink

Sourcing a file with an absolute path and using rsource in it triggered
a relpath() between the absolute path and $srctree. Since e.g.
symlink/../bar/ = bar/ is not guaranteed for symlinks, this could lead
to the rsource'd file not being found if $srctree pointed to a symlink.

Switch to a simpler, more textual method for stripping $srctree from
glob results, which should be robust against symlink shenanigans. This
also makes the code a bit easier to follow.

Discovered by Marc Herbert.

Piggyback some minor cleanup.

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