compile _bytesio and _stringio into the binary and initalize stdio before site fixing #3279

Reviewer: Alexandre Vassalotti
diff --git a/Modules/Setup.dist b/Modules/Setup.dist
index d2c8971..a2b20ca 100644
--- a/Modules/Setup.dist
+++ b/Modules/Setup.dist
@@ -113,6 +113,8 @@
 _codecs _codecsmodule.c		# access to the builtin codecs and codec registry
 _fileio _fileio.c		# Standard I/O baseline
 _weakref _weakref.c		# weak references
+_bytesio _bytesio.c		# For Lib/io.py
+_stringio _stringio.c		# For Lib/io.py
 
 # The zipimport module is always imported at startup. Having it as a
 # builtin module avoids some bootstrapping problems and reduces overhead.