debug/gdb: update Linaro GDB revision for 2013.05

Update Linaro GDB with the latest available revision.

Signed-off-by: "Michael Hope" <michaelh@juju.net.nz>
Message-Id: <bea34f42853a9d87a628.1372452016@localhost>
Patchwork-Id: 255667

 # Alpha specific configuration file

 ## select ARCH_SUPPORTS_32

 ## select ARCH_DEFAULT_32

 ## select ARCH_USE_MMU

 ## select ARCH_SUPPORTS_WITH_CPU

 ## select ARCH_SUPPORTS_WITH_TUNE

 ##

 ## help The Alpha architecture.