mk: workaround for mingw stack-protector bug

Add -mstack-protector-guard=global to work around GCC bug 86832,
where -fstack-protector will attempt to use native TLS, but mingw only
supports emulated TLS. This causes a segmentation violation at the start
of any function protected by stack-protector. The issue exists in GCC
versions prior to 8.3.

Enable -mstack-protector-guard=global which uses a global variable for
the guard value. This is the behaviour with the fix, so there is no
downside to enabling it for all versions of GCC on Windows.

Signed-off-by: Nick Connolly <nick.connolly@mayadata.io>
Change-Id: I85bc831043585071b0d8b0a3dd637b8d9ff26dab
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6575


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>