remove quotes around package name in diagnostic message

Signed-off-by: Oliver Eikemeier <eikemeier@fillmore-labs.com>

Author: eikemeier

src/cmd/compile/internal/types2/format.go

@@ -10,7 +10,6 @@ import (
 	"bytes"
 	"cmd/compile/internal/syntax"
 	"fmt"
-	"strconv"
 	"strings"
 )
 
@@ -129,7 +128,7 @@ func (check *Checker) qualifier(pkg *Package) string {
 		}
 		// If the same package name was used by multiple packages, display the full path.
 		if len(check.pkgPathMap[pkg.name]) > 1 {
-			return strconv.Quote(pkg.path)
+			return pkg.path
 		}
 		return pkg.name
 	}

src/go/types/format.go

@@ -11,7 +11,6 @@ import (
 	"fmt"
 	"go/ast"
 	"go/token"
-	"strconv"
 	"strings"
 )
 
@@ -131,7 +130,7 @@ func (check *Checker) qualifier(pkg *Package) string {
 		}
 		// If the same package name was used by multiple packages, display the full path.
 		if len(check.pkgPathMap[pkg.name]) > 1 {
-			return strconv.Quote(pkg.path)
+			return pkg.path
 		}
 		return pkg.name
 	}