configure: enable stack-protector with strict
configure: enable stack-protector with strict

The code should be sort of alloca-free now.  Allow Ubuntu to compile,
for as long as we don't clean up the flag code entirely.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb