cmd/ld: fix scope of static objects in symbol table
cmd/ld: fix scope of static objects in symbol table

All symbols are currently marked with global scope.
The correct behavior was lost when the symbol table
format was changed.

R=golang-dev, iant, r
CC=golang-dev
https://codereview.appspot.com/8625043

wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang,wesolows/golang,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang