golang: Upgrade golang14 to latest source-only release so we can bootstrap it

Otherwise it started to fail this way:

[2017-02-22 11:49:22,982] INFO     --- FAIL: TestLoadFixed (0.00s)
[2017-02-22 11:49:22,982] INFO          time_test.go:929: Now().In(loc).Zone() = "-01", -3600, want "GMT+1", -3600
[2017-02-22 11:49:22,983] INFO     FAIL
[2017-02-22 11:49:22,983] INFO     FAIL time    2.380s

See https://github.com/golang/go/issues/16352#issuecomment-255835099 and around
for details.

component/golang/buildout.cfg

@@ -19,8 +19,8 @@ environment =
 
 [golang14]
 <= golang-common
-url = https://storage.googleapis.com/golang/go1.4.3.src.tar.gz
-md5sum = dfb604511115dd402a77a553a5923a04
+url = https://storage.googleapis.com/golang/go1.4-bootstrap-20161024.tar.gz
+md5sum = 76e42c8152e8560ded880a6d1d1f53cb
 environment-extra =