17:58 danfe 

Fix a couple of bugs that prevented `games/quake2lnx' from fully working
on amd64 (and likely other 64-bit architectures):

- Prototype for `void *qwglGetProcAddress(char *symbol)' was guarded by
  #ifdef __linux__; this was not a problem on i386, where sizeof(void *)
  /actual return type/ == sizeof(int) /assumed return type of undeclared
  function/.  On amd64, returned pointer would sometimes get truncated,
  leading to a program's crash.  Mend this by turning `#ifdef __linux__'
  condition essentially into `#ifndef _WIN32'
- Software renderer was typedef'ing PIXEL24 as `unsigned long'; fix it
  by using `unsigned int' type instead
- Remove `-s' from OPTIMIZED_CFLAGS: stripping is taken care of during
  installation (subject to WITH_DEBUG); also remove optimization flag
  `-fexpensive-optimizations' as it is not being supported by Clang
- While here, fix `version' console command to report correct operating
  system and architecture names
- Employ options helper target to install documentation; add more useful
  changelogs and drop `quake2.3dfxgl' file (meaningless these days)