Move contents of builtins/* to stdlib/*. This simplifies finding stubs.

stdlib/3/zlib.pyi

@@ -0,0 +1,32 @@
+# Stubs for zlib (Python 3.4)
+#
+# NOTE: This stub was automatically generated by stubgen.
+
+# TODO: Compress and Decompress classes are not published by the module.
+
+DEFLATED = ... # type: int
+DEF_BUF_SIZE = ... # type: int
+DEF_MEM_LEVEL = ... # type: int
+MAX_WBITS = ... # type: int
+ZLIB_RUNTIME_VERSION = ... # type: str
+ZLIB_VERSION = ... # type: str
+Z_BEST_COMPRESSION = ... # type: int
+Z_BEST_SPEED = ... # type: int
+Z_DEFAULT_COMPRESSION = ... # type: int
+Z_DEFAULT_STRATEGY = ... # type: int
+Z_FILTERED = ... # type: int
+Z_FINISH = ... # type: int
+Z_FULL_FLUSH = ... # type: int
+Z_HUFFMAN_ONLY = ... # type: int
+Z_NO_FLUSH = ... # type: int
+Z_SYNC_FLUSH = ... # type: int
+
+def adler32(data, value=...) -> int: ...
+def compress(data, level: int = ...): ...
+def compressobj(level=..., method=..., wbits=..., memlevel=...,
+                strategy=..., zdict=...): ...
+def crc32(data, value=...) -> int: ...
+def decompress(data, wbits=..., bufsize=...): ...
+def decompressobj(wbits=..., zdict=...): ...
+
+class error(Exception): ...