build: fix clean scripts

Fixes #10734.

Change-Id: I7a2c580b87749225668fbd7a005412c8eee6824d
Reviewed-on: https://go-review.googlesource.com/9823Reviewed-by: Russ Cox <rsc@golang.org>

src/clean.bash

@@ -13,4 +13,5 @@ if [ ! -x $GOTOOLDIR/dist ]; then
 fi
 
 "$GOBIN/go" clean -i std
-$GOTOOLDIR/dist clean
+"$GOBIN/go" tool dist clean
+"$GOBIN/go" clean -i cmd

src/clean.bat

@@ -7,7 +7,7 @@ setlocal
 
 set GOBUILDFAIL=0
 
-go tool dist env -wp >env.bat
+go tool dist env -w -p >env.bat
 if errorlevel 1 goto fail
 call env.bat
 del env.bat
@@ -19,7 +19,8 @@ goto fail
 :distok
 
 "%GOBIN%\go" clean -i std
-%GOTOOLDIR%\dist clean
+"%GOBIN%\go" tool dist clean
+"%GOBIN%\go" clean -i cmd
 
 goto end
 

src/clean.rc

@@ -11,4 +11,5 @@ if(! test -x $GOTOOLDIR/dist){
 }
 
 $GOBIN/go clean -i std
-$GOTOOLDIR/dist clean
+$GOBIN/go tool dist clean
+$GOBIN/go clean -i cmd