Changeset 4dfeba3 in rtems for bootstrap

bootstrap: Use printf instead of echo -e for POSIX shells

On POSIX compliant shells, echo does not have the -e option.
This causes the "-e" to be echoed as well, causing potential buggy
build processes.

Example shell session:

-> % sh
$ echo -e "foo bar"
-e foo bar
$

According to POSIX, "\$" should be fine regardless due to the use of
double-quotes[1]. However, since printf is recommended over echo anyway,
we replace "echo -e" with printf where required.

[1] ​http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_02_03