Add some more missing includes:

seqdisp.c, gtime.c: SDL/SDL_timer.h for SDL_GetTicks()
piesraw.c:          SDL/SDL_video.h for SDL_GL_GetProcAddress()



git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@753 4a71c877-e1ca-e34f-864e-861f7616d084

lib/gamelib/gtime.c

@@ -5,6 +5,8 @@
  *
  */
 
+#include "SDL/SDL_timer.h"
+
 #include <time.h>
 
 //#define DEBUG_GROUP1

lib/ivis_opengl/piedraw.c

@@ -9,6 +9,7 @@
 
 #include <string.h>
 #include <SDL/SDL_opengl.h>
+#include <SDL/SDL_video.h>
 
 #include "lib/framework/frame.h"
 #include "lib/ivis_common/ivisdef.h"

src/seqdisp.c

@@ -4,6 +4,7 @@
  * Functions for the display of the Escape Sequences
  *
  */
+#include "SDL/SDL_timer.h"
 #include <physfs.h>
 
 #include "lib/framework/frame.h"