debug/gdb: a litle bit of trivial code-reordering

Move all options-setting code at the same place.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

reporter_name="Kevin Cernekee"

reporter_url="http://sourceware.org/ml/crossgcc/2011-09/msg00037.html"

reporter_comment="MIPS SDE-compatible toolchain"