qt4-webos: add no-neon option for a500 machine

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
webappmanager: add specific configuration for a500 machine

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
libwebos-gui: add eglplatform_offscreen file to package.

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>