Support older GDB versions

GDB dashboard requires at least GDB 7.7 compiled with Python 2.7 in order to work properly.

If it is really impossible to use an up-to-date version, the following script will patch the dashboard and add the missing pieces (some features may suffer from this):

mkdir -p ~/.gdbinit.d/
wget 'https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=gdb/python/lib/gdb/FrameDecorator.py;hb=4bd8fc3a1362970d9800a263987af8093798338b' -O ~/.gdbinit.d/FrameDecorator.py
sed -i '1s/^/python gdb.COMPLETE_EXPRESSION = gdb.COMPLETE_SYMBOL\n/' .gdbinit
sed -i "s/gdb_breakpoint.temporary/None/g" .gdbinit
cat >>~/.gdbinit <<EOF
python
import imp
gdb.FrameDecorator = imp.new_module('FrameDecorator')
gdb.FrameDecorator.FrameDecorator = FrameDecorator
end
EOF