pgsql: Add forgotten PL/Perl regression test files

Add forgotten PL/Perl regression test files

Due to a git hook blowing up in my face telling me I could not commit
Peter Eisentraut's patch on his name, I had to "git reset" to fix the
previous commit ... and then forgot that I needed to "git add" these
files :-(

Branch
------
REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/892a8d05440deaf0f73b91a98f35d32b9415d497

Modified Files
--------------
src/pl/plperl/expected/plperl_lc.out   |   33 +++++++++++++++++++++++++
src/pl/plperl/expected/plperl_lc_1.out |   41 ++++++++++++++++++++++++++++++++
src/pl/plperl/sql/plperl_lc.sql        |   24 ++++++++++++++++++
3 files changed, 98 insertions(+), 0 deletions(-)