$PREFIX isn't even defined in a bundle.

Per POSIX recommendation to avoid ambiguity and unnecessary
expression evaluation.

Fixes #16

Only 12 1/2 years late.

Fixes #14.

Getting strings from the binaries can return badly encoded strings which
don't match what Python is expecting. This fix discards any bad strings
which are returned and continues.

Project refuses to init if the required elements aren't present so the file is otherwise useless.

[Project] Raise an exception if there's an empty launcher tag but the project has no launcher script.

Convert to @executable_path like prefixes.

This change means that binary recursive copies preserve the directory
structure rather than flattening it out. This is critical for using
this capability in gimp where plugins have moved into sub directories.

This reverts commit 9ecfd3d0 because
it doesn't work: You can't conditionally set variables in Makefiles.

Removes duplication and all libaries are still copied.

Cf. !3 (comment 1298807)

Without this change, `dylib`s that other `dylibs` depend on are not
copied. This ensures that they are so that the full tree is copied.

It does appear, when tracing the copies, that quite a few `dylib`s are
copied more than once. A simple step of removing duplicates should
ensure this stops happening, but has not been done yet.

Copied from
https://github.com/samm-git/gtk-mac-bundler  branch: fix-otool

Ensures that otool does not error on directories and only receives
files.