Update gcc-version rsb for 4.11

[soja-lists at aries.uberspace.de]

Hi,

The current version of the rsb loads the gcc-4.9.3 sources to build gcc.
However as discussed previously Ada-support in this version is broken 
for RTEMS.
The current 4.9-branch has a fix. Would it be possible to use a recent 
snapshot of this branch for the source builder until 4.9.4 is released?

Best regards,

    Jan