Remove useless fonts

ui/css/fonts/fontawesome-webfont.* were not used anywhere
So remove them.

Signed-off-by: Aline Manera <alinefm@linux.vnet.ibm.com>
Add option to add/remove fonts files in rpm packages

By default font files will be added.
To disable it, run "./autogen.sh --disable-fonts"

Signed-off-by: ShaoHe Feng <shaohef@linux.vnet.ibm.com>
Signed-off-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Signed-off-by: Leonardo Garcia <lagarcia@br.ibm.com>