progs/glsl: compile with scons and glew

Get most of these working with scons.

progs/glsl/array.c

@@ -9,9 +9,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
-#include <GL/glext.h>
 #include "extfuncs.h"
 #include "shaderutil.h"
 
@@ -248,6 +248,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(500, 500);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);