[PR c/25892]: disable -Wpointer-sign by default

[Alexandre Oliva]

This patch implements the AFAIK-agreed-by-SC-and-RMS behavior for
-Wpointer-sign, removing the only blocker for GCC 4.1.  Branch
bootstrapped and regression tested on amd64-linux-gnu.  Ok for branch
and mainline, if forward-porting proves to be trivial?

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}