sync code with last improvements from OpenBSD

app/xlockmore/modes/glx/i_linkage.h

@@ -0,0 +1,23 @@
+#include <GL/gl.h>
+#include <GL/glx.h>
+
+typedef struct {
+  GLfloat     view_rotx, view_roty, view_rotz;
+  GLXContext *glx_context;
+  GLuint      frames;
+  int         numsteps;
+  int         construction;
+  int         time;
+  char       *partlist;
+  int         forwards;
+  Window      window;
+} spherestruct;
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  Bool invert_draw(spherestruct *gp);
+#ifdef __cplusplus
+}
+#endif