Removed misleading comment about GNU software. This module and the zlib

library have no relationship with GNU software other than implementing some of
the same algorithms and file format.  (The zlib module is more general.)

Doc/lib/libzlib.tex

@@ -6,9 +6,8 @@
 \bimodindex{zlib}
 
 For applications that require data compression, the functions in this
-module allow compression and decompression, using the zlib library,
-which is based on the GNU \program{gzip} program.  The zlib library
-has its own home page at
+module allow compression and decompression, using the zlib library.
+The zlib library has its own home page at
 \url{http://www.cdrom.com/pub/infozip/zlib/}.  Version 1.0.4 is the
 most recent version as of December, 1997; use a later version if one
 is available.

Doc/libzlib.tex

@@ -6,9 +6,8 @@
 \bimodindex{zlib}
 
 For applications that require data compression, the functions in this
-module allow compression and decompression, using the zlib library,
-which is based on the GNU \program{gzip} program.  The zlib library
-has its own home page at
+module allow compression and decompression, using the zlib library.
+The zlib library has its own home page at
 \url{http://www.cdrom.com/pub/infozip/zlib/}.  Version 1.0.4 is the
 most recent version as of December, 1997; use a later version if one
 is available.