Changes 1.2.6:

Changes 1.2.6:
* gzread() can now read a file that is being written concurrently
* gzgetc() is now a macro for increased speed
* Added a 'T' option to gzopen() for transparent writing (no compression)
* Added deflatePending() to return the amount of pending output
* Allow deflateSetDictionary() and inflateSetDictionary() at any time in raw
  mode
* deflatePrime() can now insert bits in the middle of the stream
* ./configure now creates a configure.log file with all of the results
* Added a ./configure --solo option to compile zlib with no dependency on any
  libraries
* Fixed a problem with large file support macros
* Fixed a bug in contrib/puff
* Many portability improvements