Use sreMessage instead of printf in shadow.cpp and shadowmap.cpp

Use sreMessage instead of printf in a few places in shadow.cpp and
shadowmap.cpp.

Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com>
Fix spotlight shadow map rendering

Fix rendering of spotlight shadows with shadow mapping.

Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com>