Various Windows and VC++ 2010 fixes.

examples/heightmap.c

diff --git a/examples/heightmap.c b/examples/heightmap.c
index f37c732..1d3dd72 100644
--- a/examples/heightmap.c
+++ b/examples/heightmap.c
@@ -23,6 +23,8 @@
 //
 //========================================================================
 
+#define _CRT_SECURE_NO_WARNINGS
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <math.h>
@@ -422,7 +424,7 @@
             if (fabs(pd) <= 1.0f)
             {
                 /* tx,tz is within the circle */
-                GLfloat new_height = disp + (cos(pd*3.14f)*disp);
+                GLfloat new_height = disp + (float) (cos(pd*3.14f)*disp);
                 map_vertices[1][ii] += new_height;
             }
         }