basic: define Architecture typedef in basic-forward.h

src/basic/architecture.h

@@ -9,7 +9,7 @@
  * processor features, models, generations or even ABIs. Hence we
  * focus on general family, and distinguish word width and endianness. */
 
-typedef enum {
+typedef enum Architecture {
         ARCHITECTURE_ALPHA,
         ARCHITECTURE_ARC,
         ARCHITECTURE_ARC_BE,

src/basic/basic-forward.h

@@ -83,6 +83,7 @@ struct iovec_wrapper;
 union in_addr_union;
 union sockaddr_union;
 
+typedef enum Architecture Architecture;
 typedef enum CGroupFlags CGroupFlags;
 typedef enum CGroupMask CGroupMask;
 typedef enum ChaseFlags ChaseFlags;