perl: enable _GNU_SOURCE define via d_gnulibc

perl: enable _GNU_SOURCE define via d_gnulibc

This is needed to properly support memmem() and friends under musl
as musl guards the declarations with _GNU_SOURCE define, and if the
declarations are not present, gcc will issue warnings and generate
assembly that assumes the functions return int (instead of e.g.
void*), with catastrophic consequences at runtime.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 6422e62fbc5c65a2165a72c97c880cfa9a80e957)
Signed-off-by: Peter Hurley <peter@meraki.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>