re PR go/67695 (Please improve POSIX shell compatibility of libgo/mksysinfo.sh)

	PR go/67695
    mksysinfo.sh: Use = with test rather than ==.
    
    Fixes GCC PR 67695.

    Reviewed-on: https://go-review.googlesource.com/14858

From-SVN: r228064

gcc/go/gofrontend/MERGE

-2087b95180caea3477647c449772b7fecc01a71c
+90ebe729992443dc00b19c76b28d1270e17245a4
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/mksysinfo.sh

@@ -531,7 +531,7 @@ upcase_fields () {
 # GNU/Linux specific; it should do no harm if there is no
 # _user_regs_struct.
 regs=`grep '^type _user_regs_struct struct' gen-sysinfo.go || true`
-if test "$regs" == ""; then
+if test "$regs" = ""; then
   # s390
   regs=`grep '^type __user_regs_struct struct' gen-sysinfo.go || true`
   if test "$regs" != ""; then