quagga: fix QA warning

When build quagga, it shows QA warnings:

WARNING: QA Issue: ELF binary '/home/build/poky/build/tmp/work/i586-poky-linux/quagga/0.99.21-r2.0/packages-split/quagga-bgpd/usr/sbin/bgpd' has relocations in .text
WARNING: QA Issue: ELF binary '/home/build/poky/build/tmp/work/i586-poky-linux/quagga/0.99.21-r2.0/packages-split/quagga-ripngd/usr/sbin/ripngd' has relocations in .text

The configure script tests compiler whether support option '-fPIE'. If
support, it pass option '-fPIE' to compiler then cause these QA
warnings.

Disable configure script to check option '-fPIC'.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>