Move "hello-static-lib" to doc/examples and add automake-less Makefiles

Move the "hello-static-lib" test to doc/examples.

The examples are now automatically built as part of the default make target
and plain Makefiles with no dependency on automake are provided for clarity.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>