debug/gdb: add gdb 7.5.1 and gdb 7.6.1

debug/gdb: add gdb 7.5.1 and gdb 7.6.1

add gdb version 7.5.1 and gdb version 7.6.1

Signed-off-by: "Daniel Zimmermann" <netzimme@gmail.com>
Message-Id: <2fc4afda19bca864dd9c.1384600083@haus-VirtualBox>
Patchwork-Id: 291762
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

 # Compute s390-specific values

 CT_DoArchTupleValues() {

     # That's the only thing to override

     if [ "${CT_ARCH_64}" = "y" ]; then

         CT_TARGET_ARCH="s390x${CT_ARCH_SUFFIX}"

     fi

 }