Support running NSIS from deployment script.

This requires a few workarounds since NSIS expects files in the source
folder but the build scripts run out-of-tree. Only added for Theme
Editor for now, since Rockbox Utility doesn't have a NSIS script yet
(and an installer for Rockbox Utility might not be that useful).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27759 a1c6a512-1295-4272-9138-f99709370657
2 files changed