LP#1707549: Remove Perl 5.24+ syntax restriction

LP#1707549: Remove Perl 5.24+ syntax restriction

Quoth the Perl docs: "An experimental feature added in Perl 5.14 allowed each,
keys, push, pop, shift, splice, unshift, and values to be called with a scalar
argument. This experiment is considered unsuccessful, and has been removed.
The postderef feature may meet your needs better."

The specific instance here was probably just a typo or thinko the did the
right thing on Perls "of a certain age" ... so, we fix that here, now.

To test:

[1] Upon applying the patch, verify that Perl 5.24+ will successfully
    compile metabib.pm, that the open-ils.storage service will
    start up, and that catalog searches continue to work.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>