cmd/link/internal/ld: remove unused call to os.Getwd

This call to os.Getwd (or getwd) has been part of the linker since the C
implementation in 7d507dc6. It stopped being used in 26438d4d, and
survived the conversion to Go in 1f9dbb60.

Its return value goes unused (the linker gets the value for AT_comp_dir in
dwarf.go), remove it.

Change-Id: I3d4594813bb4ee0a6af31a36e19d99ec4b863677
Reviewed-on: https://go-review.googlesource.com/19655Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/link/internal/ld/sym.go

@@ -34,8 +34,6 @@ package ld
 import (
 	"cmd/internal/obj"
 	"log"
-	"os"
-	"path/filepath"
 	"strconv"
 )
 
@@ -70,13 +68,6 @@ func linknew(arch *LinkArch) *Link {
 		log.Fatalf("invalid goarch %s (want %s)", p, arch.Name)
 	}
 
-	var buf string
-	buf, _ = os.Getwd()
-	if buf == "" {
-		buf = "/???"
-	}
-	buf = filepath.ToSlash(buf)
-
 	ctxt.Headtype = headtype(obj.Getgoos())
 	if ctxt.Headtype < 0 {
 		log.Fatalf("unknown goos %s", obj.Getgoos())