go.text/language: no longer compiles in Go 1.1

[gopherbot]

by Jens.Alfke:

The package "code.google.com/p/go.text/language" no longer compiles in Go 1.1,
because it uses the identifier sort.Stable that was added in Go 1.2.

This breaks any software that imports that package, which needs to build in Go 1.1.
For the real-life example that triggered this bug report, see
https://travis-ci.org/couchbaselabs/walrus/builds/12025979

STEPS TO REPRODUCE
1. Install Go 1.1.2
2. go get -u code.google.com/p/go.text/language

RESULT
code.google.com/p/go.text/language/parse.go:598: undefined: sort.Stable

EXPECTED RESULT
Successful installation

[ianlancetaylor]

Comment 1:

If necessary we can build tags here.

[gopherbot]

Comment 2 by Jens.Alfke:

Looks like this happened in the most recent commit, 40d3e0c98d89.

[mpvl]

Comment 3:

I've fixed this with CL 14265043, which only uses stable sort for Go 1.2 and uses its
own (slower) implementation for Go 1.1.

[robpike]

Comment 4:

Status changed to Started.

[mpvl]

Comment 5:

This issue was closed by revision golang/text@9f86e0b.

Status changed to Fixed.