gcc: realize gas supports visibility

	. solution for "warning: visibility attribute not supported in
	  this configuration"
	. needed to make warnings fatal, -Werror

Change-Id: If972300a82df570093f2d89825935483ff69fb18
weatherstation: BeagleBone Weather Cape demo app.

The BeagleBone Weather cape enhances the BeagleBone's capabilities
by providing environment sensors (temperature, humidity, pressure,
and ambient light level).

The weatherstation demo is a port of the bonescript weatherstation
to Minix. It provides a nice visual display of the sensor data in
a web browser.

The code is installed to /usr/share/beaglebone/weather on 'earm'
and an embedded web server is started at boot time on port 80
when the cape is attached. Further details are provided in the
README.txt file.

Change-Id: I1596a2b66b213762ace26c0c750c8154c76b5c6e