Add FontConfig "yes/no" configure option descriptions

Change-Id: I30514905d2c5bb3ca4ab176d02f3094badedd0a3
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Rename CFG_LIBFREETYPE to CFG_FREETYPE for consistency

Change-Id: Id1c240a849792e6196162662429a72ce2e293ba3
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Add FreeType2 "no/qt/system" configure option with description

Change-Id: I9510a492efadc0262e689de8fb2ac1750bf253ff
Reviewed-by: Lars Knoll <lars.knoll@digia.com>