testsuite: fix gotest for absolute srcdir

    
    The recent changes to Makefile.am mean that if you configure with an
    absolute path as srcdir then gotest will be invoked with absolute paths
    for the files.  That case never worked.  This patch fixes it.
    
    Reviewed-on: https://go-review.googlesource.com/25587

From-SVN: r239256

gcc/go/gofrontend/MERGE

-5e4c16d4fea39835e16f17c3d2b2e85f5c81d815
+2c88d4871558f0451a0ad152a7052dcfaecb254f
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/testsuite/gotest

@@ -217,18 +217,27 @@ x)
 		;;
 	*)
 		for f in $pkgfiles; do
-		    if test -f $basedir/$f; then
-			b=`basename $f`
-			rm -f $b
-			cp $basedir/$f $b
-		    elif test -f ../../$f; then
-			b=`basename $f`
-			rm -f $b
-			cp ../../$f $b
-		    else
-			echo "file $f not found" 1>&2
-			exit 1
-		    fi
+                    case $f in
+                    /*)
+                        b=`basename $f`
+                        rm -f $b
+                        cp $f $b
+                        ;;
+                    *)
+		        if test -f $basedir/$f; then
+			  b=`basename $f`
+			  rm -f $b
+			  cp $basedir/$f $b
+		        elif test -f ../../$f; then
+			  b=`basename $f`
+			  rm -f $b
+			  cp ../../$f $b
+		        else
+			  echo "file $f not found" 1>&2
+			  exit 1
+		        fi
+                        ;;
+                    esac
 		done
 		for f in `cd $srcdir; ls *_test.go`; do
 		    rm -f $f
@@ -252,18 +261,27 @@ x)
 		;;
 	*)
 		for f in $pkgfiles; do
-		    if test -f $basedir/$f; then
-			b=`basename $f`
-			rm -f $b
-			cp $basedir/$f $b
-		    elif test -f ../../$f; then
-			b=`basename $f`
-			rm -f $b
-			cp ../../$f $b
-		    else
-			echo "file $f not found" 1>&2
-			exit 1
-		    fi
+                    case $f in
+                    /*)
+                        b=`basename $f`
+                        rm -f $b
+                        cp $f $b
+                        ;;
+                    *)
+		        if test -f $basedir/$f; then
+			  b=`basename $f`
+			  rm -f $b
+			  cp $basedir/$f $b
+		        elif test -f ../../$f; then
+			  b=`basename $f`
+			  rm -f $b
+			  cp ../../$f $b
+		        else
+			  echo "file $f not found" 1>&2
+			  exit 1
+		        fi
+                        ;;
+                    esac
 		done
 		;;
 	esac