gcc-4.5: Backport with-linker-hash-style and backports from FSF & linaro

backport --with-linker-hash-style from trunk, fix GNU_HASH QA warnings
once for all

Explicitly disable configuring with cloog/ppl while building gcc
if the user has it installed on build box then gcc's configure will try
to use it and it can go wrong and create problems since we never built
it so

Move to tip of FSF gcc-4_5-branch
brings in bug fixes

PR 50091/ppc 50464/x86 50273/fortran 44473/c++ mangler
49965/sparc 50565/c 50659/fortran 50618/c++ 50737/alpha 50793/c++
50788/x86/SSE 50691/pa  50875/x86/SSE
50979/sparc 30282/ppc 51187/rtl 50888/bootstrap 48190/debug/QEMUhog

Merge fix for LP689887/linaro
https://bugs.launchpad.net/gcc-linaro/+bug/689887



Signed-off-by: Khem Raj <raj.khem@gmail.com>