cmd/link: remove alternate -X flag spelling

The Go 1.6 release notes say we'll remove the “-X name value” form
(in favor of the “-X name=value” form) in Go 1.7.
Do that.

Also establish the doc/go1.7.txt file.

Change-Id: Ie4565a6bc5dbcf155181754d8d92bfbb23c75338
Reviewed-on: https://go-review.googlesource.com/19614
Reviewed-by: Ian Lance Taylor <iant@golang.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/test/linkx_run.go b/test/linkx_run.go
index a6c7c67014..440271ac4a 100644
--- a/test/linkx_run.go
+++ b/test/linkx_run.go
@@ -18,7 +18,7 @@ import (
 )
 
 func main() {
-	test(" ") // old deprecated syntax
+	// test(" ") // old deprecated & removed syntax
 	test("=") // new syntax
 }