libgui: Add pre-MR2-compatible symbol for setPosition

SurfaceControl::setPosition now takes floats instead of integers as
arguments, which breaks linkability from pre-MR2 blobs. Add a direct
compatibility wrapper, since the values are treated in the same
way.

Change-Id: I0fd0708faeb4495a2dbbb659997d6500f165ec98
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>
libgui: Add ICS/MR0-compatible client::createSurface constructors

Change-Id: Ia5b04d93320c65ac32a92cbd93daa6a64e6cee1c
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>