language: remove compatibility with go < 1.2

This was added in 9f86e0b to provide
compatibility with go1.1, which is an obsolete version.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

language/go1_1.go

@@ -6,6 +6,7 @@ package language
 
 import (
 	"errors"
+	"sort"
 	"strconv"
 	"strings"
 
@@ -206,7 +207,7 @@ func ParseAcceptLanguage(s string) (tag []Tag, q []float32, err error) {
 		tag = append(tag, t)
 		q = append(q, float32(w))
 	}
-	sortStable(&tagSort{tag, q})
+	sort.Stable(&tagSort{tag, q})
 	return tag, q, nil
 }