Don't force building target GMP and MPFR when a native gdb is built. Rather,
add a config knob to configure the native gdb to use or not to use GMP and
MPFR; _this_config_knob_ will force building the target GMP and MPFR only if
turned on.

/trunk/scripts/build/debug/300-gdb.sh | 2 1 1 0 +-
/trunk/config/debug/gdb.in | 21 19 2 0 +++++++++++++++++++--
2 files changed, 20 insertions(+), 3 deletions(-)

 # Kernel options

 menu "Kernel"

 choice

     bool

     prompt "Target OS"

     default KERNEL_LINUX

 config KERNEL_LINUX

     bool

     prompt "linux"

     help

       Build a toolchain targeting systems running Linux as a kernel.

 endchoice

 config KERNEL_VERSION

     string

 if KERNEL_LINUX

 source config/kernel/linux.in

 endif

 endmenu