lib: drop snake_case from io/types/bufio/net/os exports

lib/bufio/bufio.ww

@@ -7,17 +7,17 @@
 // revision will replace it with *io.stream once `use` resolves
 // types from imported modules.
 
-type stream_p = *void;
+type streamp = *void;
 
 type buf = struct {
-	s:    stream_p,
+	s:    streamp,
 	data: *u8,
 	cap:  i32,
 	r:    i32,	// read cursor
 	w:    i32,	// write cursor (for writers)
 };
 
-export fn rinit(b: *buf, s: stream_p, data: *u8, cap: i32) void = {
+export fn rinit(b: *buf, s: streamp, data: *u8, cap: i32) void = {
 	b.s = s;
 	b.data = data;
 	b.cap = cap;