Use bootstrap script consistently

Now that ./xlat/gen.sh has to be run before autoreconf,
replace all autoreconf calls with ./bootstrap call.

* bootstrap: Forward arguments to autoreconf.
* build_static_example.sh: Replace autoreconf call with bootstrap call.
* make-dist: Likewise.
* qemu_multiarch_testing/README: Likewise.
diff --git a/make-dist b/make-dist
index fffedfb..16c9797 100755
--- a/make-dist
+++ b/make-dist
@@ -16,7 +16,7 @@
 
 ./git-set-file-times
 
-autoreconf -i -f
+./bootstrap
 
 ./configure --enable-maintainer-mode