build: add a few missing --no-print-directory

Reported by W. Michael Petullo <mike@flyn.org>

Fixes #1269.

R=r, r2
CC=golang-dev
https://golang.org/cl/3618041

doc/progs/run

@@ -5,7 +5,7 @@
 
 set -e
 
-eval $(gomake -f ../../src/Make.inc go-env)
+eval $(gomake --no-print-directory -f ../../src/Make.inc go-env)
 
 if [ -z "$O" ]; then
 	echo 'missing $O - maybe no Make.$GOARCH?' 1>&2

src/cmd/gc/mkbuiltin

@@ -10,7 +10,7 @@
 
 set -e
 
-eval $(gomake -f ../../Make.inc go-env)
+eval $(gomake --no-print-directory -f ../../Make.inc go-env)
 if [ -z "$GC" ]; then
 	echo 'missing $GC - gomake failed?' 1>&2
 	exit 1

src/make.bash

@@ -90,7 +90,7 @@ done
 # Implemented as a function so that all.bash can repeat the output
 # after run.bash finishes running all the tests.
 installed() {
-	eval $(gomake -f Make.inc go-env)
+	eval $(gomake --no-print-directory -f Make.inc go-env)
 	echo
 	echo ---
 	echo Installed Go for $GOOS/$GOARCH in "$GOROOT".