build: fix typo in androidtest.bash

Change-Id: Idd72e095ad64e1a398058982422c2c5497a23ce5
Reviewed-on: https://go-review.googlesource.com/2739Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/androidtest.bash

@@ -11,7 +11,7 @@ set -e
 ulimit -c 0 # no core files
 
 if [ ! -f make.bash ]; then
-	echo 'nacl.bash must be run from $GOROOT/src' 1>&2
+	echo 'androidtest.bash must be run from $GOROOT/src' 1>&2
 	exit 1
 fi