winecfg: Add library override instead of closing winecfg when pressing ENTER.

[Sebastian Lackner]

Changes the meaning of ENTER while the user is typing in a library name.

Based on a patch by Hugh McMaster.
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 programs/winecfg/libraries.c | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)
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