Add support for building Insight instead of gdb (only for the cross-gdb).

/trunk/scripts/build/debug/300-gdb.sh | 62 55 7 0 ++++++++++++++++++++++++++++++++++++-----
/trunk/config/debug/gdb.in | 13 13 0 0 +++++++++
2 files changed, 68 insertions(+), 7 deletions(-)

 # Compute x86_64-specific values

 CT_DoArchValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

 }