Change const_iterator to iterator in list::splice()
Change const_iterator to iterator in list::splice()

C++11 should support const_iterator, but it may have
some problem in old version gcc.

Signed-off-by: Zhebin Jin <9240e21fe5afbd54444bbec51b3c56cc801f2340@intel.com>

Rasterer/glSoftPipe,Rasterer/glSoftPipe