fix incorrect gnulib getcwd replacement when cross-compiling GDB
This fixes a GDB crash observed on Android 8.0 when GDB was
cross-compiled. This patch is a backport of a patch pushed
upstream in gnulib.
gdb/ChangeLog (Sergio Durigan Junior <sergiodj@redhat.com>):
PR gdb/23558
* gnulib/import/m4/getcwd-path-max.m4: Add handling of Hurd,
Linux and kFreeBSD platforms.
* gnulib/configure: Regenerate.