semaphore: correct the size of semaphore for LLP64

The `dsema_value` field was marked as long which is incorrect for LLP64
environments.  Update the type to `intptr_t` which is the portable type
for this value.

Author: compnerd

src/queue.c

@@ -571,7 +571,7 @@ dispatch_block_testcancel(dispatch_block_t db)
 	return (bool)(dbpd->dbpd_atomic_flags & DBF_CANCELED);
 }
 
-long
+intptr_t
 dispatch_block_wait(dispatch_block_t db, dispatch_time_t timeout)
 {
 	dispatch_block_private_data_t dbpd = _dispatch_block_get_data(db);

src/semaphore_internal.h

@@ -32,7 +32,7 @@ struct dispatch_queue_s;
 DISPATCH_CLASS_DECL(semaphore, OBJECT);
 struct dispatch_semaphore_s {
 	DISPATCH_OBJECT_HEADER(semaphore);
-	long volatile dsema_value;
+	intptr_t volatile dsema_value;
 	intptr_t dsema_orig;
 	_dispatch_sema4_t dsema_sema;
 };