Update gcc on AT next and fix patch
Update gcc on AT next and fix patch

Bump to revision 6a6926635c36

This revision contains the fixes for gcc PR98146, that was causing glibc stage 1
to fail with a newer gcc.

Also, apply updated version of patch to fix libssp issues as the previous one
was not applying cleanly on top of the latest GCC revision.

Signed-off-by: Matheus Castanho <531577e2ea6a1eef9cdabce582a2b074021a1180@linux.ibm.com>

advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain,advancetoolchain/advance-toolchain