crosstool-ng: Pull in the missing patches for 1.27

Add back the patches from zephyr-crosstool-ng-1.25.0 that were missed
while porting to crosstool-ng 1.27.0.

In particular, "gdb: Add CT_GDB_CROSS_STATIC_LIBSTDCXX configuration" is
absolutely critical in making the GDB executable self-contained on all
host systems and usable on Windows.

Also note that the "gdb: Refactor cross GDB build step" patch initially
ported by Anas is reverted because it messed up the file indentation by
mixing spaces and tabs -- I have done another iteration of this with the
correct indentation in this series.

"cross-gdb: Add LZMA support configuration " and "cross-gdb: Add Guile
scripting support configuration" are ported as well because they are
still relevant and useful. These will be eventually upstreamed.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: stephanosio