make.bash: more robustly detect gold 2.20
On recent Debian systems the gold 2.20 check triggers though
Debian doesn't have version 2.20 but rather has:
GNU gold (GNU Binutils for Debian 2.21.52.20110606) 1.11
^^^^
R=rsc, iant
CC=golang-dev
https://golang.org/cl/5252055
diff --git a/src/make.bash b/src/make.bash
index 84b9908..57a5707 100755
--- a/src/make.bash
+++ b/src/make.bash
@@ -10,7 +10,7 @@
fi
. ./env.bash
-if ld --version 2>&1 | grep 'gold.*2\.20' >/dev/null; then
+if ld --version 2>&1 | grep 'gold.* 2\.20' >/dev/null; then
echo 'ERROR: Your system has gold 2.20 installed.'
echo 'This version is shipped by Ubuntu even though'
echo 'it is known not to work on Ubuntu.'
