[gdm-list] a couple of misc fixes

["Ray Strode" <halfline gmail com>]

Hi,

Two small fixes tonight:

1) add locale.h to fix compile
2) only call signal_list_free on elements in signal lookup hash table,
when the hash table is about to be destroyed. Previously,
signal_list_free was set up as the value destroy notifier.  The
problem is the destroy notifier gets called on every
g_hash_table_insert call (well except for the first one), so the list
being appended to/reinserted was getting clobbered.

--Ray

Attachment: signal.patch
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Attachment: locale.patch
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