eudev: set configure option --with-rootlibexecdir

eudev: set configure option --with-rootlibexecdir

Set configure option '--with-rootlibexecdir' for eudev to fix udev.pc file conflict:

| file /usr/share/pkgconfig/udev.pc conflicts between attempted installs of eudev-dev-3.2.5-r0.core2_64 and lib32-eudev-dev-3.2.5-r0.x86

It alway sets 'udevdir' in udev.pc with value '/lib/udev' that systemd
does the same thing.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>