bluez4: use PACKAGECONFIG to control 'pie'

bluez4: use PACKAGECONFIG to control 'pie'

This lets us control whether we build position independent executables. As, as
far as I know no distros are adding a 'pie' distro feature, the effect of this
commit for most will be to disable pie in bluez4. I think this is best to
ensure consistent behavior among the recipes with regard to this.

This also sidesteps a build failure I've seen with bluez4 failing due to
libudev.a not having been built fPIC.

(From OE-Core rev: 06b5d57e89f2dd20fb3f4cb9fd362e2d428f493d)

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>