Clean up the string functions

Avoid two evaluations of src in util_strpcpy clean the code in the ones
where the pointer passed is not modified and merge the main loop of
util_strpcpyl and util_strscpyl into util_strpcpyv.  Also make strpcpy
more compact by removing some unnecessary arithmetic.

Cleanup util_strpcpyv by shortcutting size == 0 case

Do some style fixups

Signed-off-by: Ian Stakenvicius <axs@gentoo.org>

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