glx: remove depency on glheader.h and GLboolean type in XF86DRI code

Return Bool instead of GLboolean to match other functions.
Define PUBLIC/USED macros locally.
diff --git a/src/glx/x11/XF86dri.c b/src/glx/x11/XF86dri.c
index 5b0bf14..a33de93 100644
--- a/src/glx/x11/XF86dri.c
+++ b/src/glx/x11/XF86dri.c
@@ -43,9 +43,19 @@
 #include <X11/Xlibint.h>
 #include <X11/extensions/Xext.h>
 #include <X11/extensions/extutil.h>
-#include "glheader.h"
 #include "xf86dristr.h"
 
+
+#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 303
+#  define PUBLIC __attribute__((visibility("default")))
+#  define USED __attribute__((used))
+#else
+#  define PUBLIC
+#  define USED
+#endif
+
+
+
 static XExtensionInfo _xf86dri_info_data;
 static XExtensionInfo *xf86dri_info = &_xf86dri_info_data;
 static char xf86dri_extension_name[] = XF86DRINAME;
@@ -375,7 +385,7 @@
 					   context, hHWContext );
 }
 
-PUBLIC GLboolean XF86DRIDestroyContext(Display *dpy, int screen, 
+PUBLIC Bool XF86DRIDestroyContext(Display *dpy, int screen, 
     XID context )
 {
     XExtDisplayInfo *info = find_display (dpy);
@@ -396,7 +406,7 @@
     return True;
 }
 
-PUBLIC GLboolean XF86DRICreateDrawable(Display *dpy, int screen, 
+PUBLIC Bool XF86DRICreateDrawable(Display *dpy, int screen, 
     XID drawable, drm_drawable_t * hHWDrawable )
 {
     XExtDisplayInfo *info = find_display (dpy);
@@ -430,7 +440,7 @@
     return 0;
 }
 
-PUBLIC GLboolean XF86DRIDestroyDrawable(Display *dpy, int screen,
+PUBLIC Bool XF86DRIDestroyDrawable(Display *dpy, int screen,
     XID drawable )
 {
     XExtDisplayInfo *info = find_display (dpy);
@@ -452,7 +462,7 @@
      * the windows is gone, by wrapping the destroy call in an error
      * handler. */
 
-    XSync(dpy, GL_FALSE);
+    XSync(dpy, False);
     oldXErrorHandler = XSetErrorHandler(noopErrorHandler);
 
     LockDisplay(dpy);
diff --git a/src/glx/x11/xf86dri.h b/src/glx/x11/xf86dri.h
index cd650b5..a7d2a89 100644
--- a/src/glx/x11/xf86dri.h
+++ b/src/glx/x11/xf86dri.h
@@ -92,13 +92,13 @@
 Bool XF86DRICreateContextWithConfig( Display *dpy, int screen, int configID,
     XID *ptr_to_returned_context_id, drm_context_t *hHWContext );
 
-extern GLboolean XF86DRIDestroyContext( Display *dpy, int screen,
+extern Bool XF86DRIDestroyContext( Display *dpy, int screen,
     XID context_id );
 
-extern GLboolean XF86DRICreateDrawable( Display *dpy, int screen,
+extern Bool XF86DRICreateDrawable( Display *dpy, int screen,
     XID drawable, drm_drawable_t *hHWDrawable );
 
-extern GLboolean XF86DRIDestroyDrawable( Display *dpy, int screen, 
+extern Bool XF86DRIDestroyDrawable( Display *dpy, int screen, 
     XID drawable);
 
 Bool XF86DRIGetDrawableInfo( Display *dpy, int screen, Drawable drawable,