Improve efficiency of recent changes to plperl's sv2cstr().

Andrew Dunstan <andrew@dunslane.net>

Commit: ef007e67022bf7f2367aa10fd226d6fb86b6fb9c
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2012-01-15T21:20:39Z
Releases: 9.1.3
Improve efficiency of recent changes to plperl's sv2cstr().

Along the way, add a missing dependency in the GNUmakefile.

Alex Hunsaker, with a slight adjustment by me.

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