build: disable static cgo linking test on netbsd
We get
/usr/lib/libc.a(stack_protector.o): In function `__stack_chk_fail_local':
stack_protector.c:(.text+0x158): multiple definition of `__stack_chk_fail_local'
/var/tmp/go-link-04838a/000001.o:/tmp/gobuilder/netbsd-386-minux-
c7a9e9243878/go/src/pkg/runtime/cgo/gcc_386.S:41: first defined here
I am assuming this has never worked and possibly is not intended to work.
(Some systems are vehemently against static linking.)
TBR=iant
CC=golang-codereviews
https://golang.org/cl/
88130046