Disable cross-gdb in nios2-elf-mingw32.

Building cross-gdb in canadian cross requires expat/ncurses for the
host. Currently, 300-gdb.sh only builds expat/ncurses for the target
(for native-gdb). For cross-gdb on regular cross (build==host), expat
and ncurses are expected to be provided by the host.

There are two approaches possible:

- If building for canadian cross, build expat/ncurses for cross-gdb
  just as the native-gdb does.
- Promote expat/ncurses to first class citizens and build them as
  companion libs during the build of the build-to-host toolchain.

I am leaning towards the latter approach - it would also allow to
specify the versions for expat/ncurses rather than have them hardcoded
in 300-gdb.sh - but would appreciate feedback.

Signed-off-by: Alexey Neyman <stilor@att.net>

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