- Update homepage URL and set a minimal package description
  (found one in tarball announcement mails)

- improved -devel provides/obsoletes for openSUSE 12.2

- added provides/obsoletes for old libXi6-devel package 

- Rename SRPM from libXi6 to libXi (no Obsoletes needed for BRPMs)

- Remove apparently unused (Build)Requires on Xau, Xdmcp, xtrans
- Add required runtime dependency on libXext-devel
  (XInput2.h uses libXext-devel:Xge.h)
- Use pkgconfig() symbols to pull in BuildRequires
- Remove redundant tags/sections like %clean
- Parallel build with %_smp_mflags

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