libio-pty-perl: fix QA issue for multilib

bitbake lib32-libio-pty-perl
[snip]
ERROR: QA Issue: non debug package contains .debug directory: lib32-libio-pty-perl path
/work/x86-pokymllib32-linux/lib32-libio-pty-perl/1.10-r0/packages-split/lib32-libio-pty-perl/usr/lib/perl/vendor_perl/5.20.0/auto/IO/Tty/.debug/Tty.so [debug-files]
[snip]

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>