More pre-2.3 build tweaks for the OS/2 EMX port:

- more clean up of the generated import library definiton (.DEF file)
  following checking of patch 770521, and tightening of the sed regexps.

- use -O3 even with gcc 2.8.1 - worth nearly 10% with 2.3; worth
  nothing with 2.2.x.

- clean up a couple of whitespace issues introduced by a cut'n'paste.

PC/os2emx/python23.def

@@ -1070,18 +1070,6 @@ EXPORTS
 
 ; From python23_s.lib(itertoolsmodule)
 ;  "inititertools"
-;  "cycle_type"
-;  "dropwhile_type"
-;  "takewhile_type"
-;  "islice_type"
-;  "starmap_type"
-;  "imap_type"
-;  "chain_type"
-;  "ifilter_type"
-;  "ifilterfalse_type"
-;  "count_type"
-;  "izip_type"
-;  "repeat_type"
 
 ; From python23_s.lib(_localemodule)
 ;  "init_locale"