Remove obsolete $Id$ svn substitution marks.

Subversion, like cvs, had a mechanism for replacing inline template
text on checkout for representing things like 'last modified date'.

Git does not support this, so remove the template strings from
file header comments.

Also less aggressive language is os_types.h.
diff --git a/include/ogg/ogg.h b/include/ogg/ogg.h
index 7609fc2..c4325aa 100644
--- a/include/ogg/ogg.h
+++ b/include/ogg/ogg.h
@@ -11,7 +11,6 @@
  ********************************************************************
 
  function: toplevel libogg include
- last mod: $Id$
 
  ********************************************************************/
 #ifndef _OGG_H
diff --git a/include/ogg/os_types.h b/include/ogg/os_types.h
index b8f5630..fa4ac4a 100644
--- a/include/ogg/os_types.h
+++ b/include/ogg/os_types.h
@@ -10,8 +10,7 @@
  *                                                                  *
  ********************************************************************
 
- function: #ifdef jail to whip a few platforms into the UNIX ideal.
- last mod: $Id$
+ function: Define a consistent set of types on each platform.
 
  ********************************************************************/
 #ifndef _OS_TYPES_H
diff --git a/src/bitwise.c b/src/bitwise.c
index fa2b572..81865ef 100644
--- a/src/bitwise.c
+++ b/src/bitwise.c
@@ -11,7 +11,6 @@
  ********************************************************************
 
   function: packing variable sized words into an octet stream
-  last mod: $Id$
 
  ********************************************************************/
 
diff --git a/src/framing.c b/src/framing.c
index ee29651..5e09f2d 100644
--- a/src/framing.c
+++ b/src/framing.c
@@ -12,7 +12,6 @@
 
  function: code raw packets into framed OggSquish stream and
            decode Ogg streams back into raw packets
- last mod: $Id$
 
  note: The CRC code is directly derived from public domain code by
  Ross Williams (ross@guest.adelaide.edu.au).  See docs/framing.html
diff --git a/win32/ogg.def b/win32/ogg.def
index 250e4ba..f88a434 100644
--- a/win32/ogg.def
+++ b/win32/ogg.def
@@ -1,6 +1,6 @@
-; $Id$
 ;
 ; ogg.def
+; List of exported functions for Windows builds.
 ;
 LIBRARY
 EXPORTS