Setting the ChangeLog rule as phony forces it to be re-run even when the
ChangeLog file already exists. Research indicates .PHONY is portable to BSD and
Solaris make.
(cherry picked from b8a98809ed commit)
- For Xcomposite and Xdamage, don't link the build system out of the xc tree
- Link the public X11 headers into their own directory
- Add links to XKeysymDB and XErrorDB
- Add links to all the Xlib man pages
- Add links to the lcUniConv subdirectory
- Conditionally include config.h in Xlib source