[git commit nptl] build: Get rids of PIC macro using compiler flag __PIC__ instead

[Carmelo Amoroso]

commit: http://git.uclibc.org/uClibc/commit/?id=9849c407e8e6732fbf417cb447937e3b3b9a54ec
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/nptl

Based on Peter Mazinger's comments on a recent commit, I decided
to get rids of all occurrences of PIC changing them to __PIC__

Signed-off-by: Carmelo Amoroso <carmelo.amoroso at st.com>

Patch is too large, so refusing to show it