makedef: Handle tabbed version scripts properly
makedef: Handle tabbed version scripts properly

Not all sed and grep variants support '\t', so use tr. This
also fixes the current sed regexes.

Fixes #9.

Signed-off-by: Derek Buitenhuis <aff7d637ede26ea82e5226e01b697996cc52e526@gmail.com>

libav/c99-to-c89,mstorsjo/c99-to-c89,mstorsjo/c99-to-c89,libav/c99-to-c89