build: add all-qemu.bash, handful of arm fixes

R=r
CC=golang-dev
https://golang.org/cl/4313051
diff --git a/src/run.bash b/src/run.bash
index dd80d3a..90fa632 100755
--- a/src/run.bash
+++ b/src/run.bash
@@ -98,6 +98,7 @@
 time ./run
 ) || exit $?
 
+[ "$GOARCH" == arm ] ||  # uses network, fails under QEMU
 (xcd ../doc/codelab/wiki
 gomake clean
 gomake