[Bug c/18382] define __pic__ and/or __PIC__ in c-cppbuiltins.c instead of scattershot in target config

[pinskia at gcc dot gnu dot org]

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           What    |Removed                     |Added
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   Target Milestone|4.1.0                       |---


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18382