go: makes it build for the case $GOROOT has whitespaces

src/pkg/exp/eval/test.bash

 #!/usr/bin/env bash
 # Copyright 2009 The Go Authors.  All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
 # Run the interpreter against all the Go test programs
 # that begin with the magic
 #       // $G $D/$F.go && $L $F.$A && ./$A.out
 # line and do not contain imports.
 
 set -e
 make
 6g main.go && 6l main.6
 (
-for i in $(egrep -l '// \$G (\$D/)?\$F\.go \&\& \$L \$F\.\$A && \./\$A\.out' $GOROOT/test/*.go $GOROOT/test/*/*.go)
+for i in $(egrep -l '// \$G (\$D/)?\$F\.go \&\& \$L \$F\.\$A && \./\$A\.out' "$GOROOT"/test/*.go "$GOROOT"/test/*/*.go)
 do
         if grep '^import' $i >/dev/null 2>&1
         then
                 true
         else
-                if $GOROOT/usr/austin/eval/6.out -f $i >/tmp/out 2>&1 && ! test -s /tmp/out
+                if "$GOROOT"/usr/austin/eval/6.out -f $i >/tmp/out 2>&1 && ! test -s /tmp/out
                 then
                         echo PASS $i
                 else
                         echo FAIL $i
                         (
                                 echo '>>> ' $i
                                 cat /tmp/out
                                 echo
                         ) 1>&3
                 fi
         fi
 done | (tee /dev/fd/2 | awk '{print $1}' | sort | uniq -c) 2>&1
 ) 3>test.log