Add mkspec for the STMicroelectronic's ST7108 platform to be used in
conjunction with the -device support in configure. This allows you
to build Qt with the application libraries provided by STM SDK 35.
Change-Id: I36aa174200f034ccd6ee285e3f8a8ffec99b3e70
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>