i965/drm: Make libdrm_lists.h compile by defining typeof.

typeof doesn't seem to exist, so this won't compile (but we don't yet
try).  Define it to __typeof__.  This code is going to die soon anyway.

Acked-by: Jason Ekstrand <jason@jlekstrand.net>

src/mesa/drivers/dri/i965/libdrm_lists.h

@@ -31,6 +31,10 @@
 
 #include <stddef.h>
 
+#ifndef typeof
+#define typeof __typeof__
+#endif
+
 typedef struct _drmMMListHead
 {
     struct _drmMMListHead *prev;