pgsql: Fix msvc install script to properly install NLS files when built

Log Message:
-----------
Fix msvc install script to properly install NLS files when built with
gettext.

Modified Files:
--------------
pgsql/src/tools/msvc:
Install.pm (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Install.pm?r1=1.26&r2=1.27)