devel/gnulib: Fix shebangfix for clisp

Uses/shebangfix.mk doesn't know about clisp, and without this, stage-qa
complains when ${LOCALBASE} is not /usr/local since we don't replace the
shebang.

Reviewed by: arrowd
Approved by: arrowd (ports)
Differential Revision: https://reviews.freebsd.org/D52630