A bunch of fixes/improvements to the gdb build:
- allow native builds (both shared and static)
- fix enabling threads
- better handle the gdbserver case
- introduce the ncurses library to allow native builds
- re-order config options adequately

/trunk/scripts/build/debug/300-gdb.sh | 126 79 47 0 ++++++++++++++++++++++++++---------------
/trunk/config/debug/gdb.in | 45 33 12 0 +++++++++++----
2 files changed, 112 insertions(+), 59 deletions(-)

comment "ARM specific options"

config ARCH_ARM_EABI

    bool

    prompt "Use EABI (EXPERIMENTAL)"

    depends on EXPERIMENTAL

    default n

    help

      Set up the toolchain so that it generates EABI-compliant binaries.

config ARCH_ABI

    default "aapcs" if ARCH_ARM_EABI