dbus: fix building on mipsel and clean up PIE/pie fix to work again.

dbus: fix building on mipsel and clean up PIE/pie fix to work again.

D-Bus fails to link with --gc-sections on mipsel.

|   CCLD   dbus-daemon
| collect2: ld returned 1 exit status
| make[2]: *** [dbus-daemon] Error 1
| make[2]: *** Waiting for unfinished jobs....
| /home/grg/oe2/tmp/cross/mipsel/lib/gcc/mipsel-oe-linux/4.4.4/../../../../mipsel-oe-linux/bin/ld: can not make stub section: File format not recognized
| /home/grg/oe2/tmp/cross/mipsel/lib/gcc/mipsel-oe-linux/4.4.4/../../../../mipsel-oe-linux/bin/ld: failed to set dynamic section sizes: File format not recognized

Also, the previous fPIE/pie fix no longer works.
While here, clean up INC_PR.

Signed-off-by: Graham Gower <graham.gower@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>