Add and update include guards

Include guards in most changed files were missing, I added them keeping
the same style as other SDL files. In some cases I moved the include
guards around to be the first thing the header has to take advantage of
any possible improvements compiler may have for inclusion guards.

src/render/software/SDL_rotate.h

@@ -19,6 +19,9 @@
   3. This notice may not be removed or altered from any source distribution.
 */
 
+#ifndef SDL_rotate_h_
+#define SDL_rotate_h_
+
 #ifndef MIN
 #define MIN(a,b)    (((a) < (b)) ? (a) : (b))
 #endif
@@ -26,3 +29,4 @@
 extern SDL_Surface *SDLgfx_rotateSurface(SDL_Surface * src, double angle, int centerx, int centery, int smooth, int flipx, int flipy, int dstwidth, int dstheight, double cangle, double sangle);
 extern void SDLgfx_rotozoomSurfaceSizeTrig(int width, int height, double angle, int *dstwidth, int *dstheight, double *cangle, double *sangle);
 
+#endif /* SDL_rotate_h_ */