Bug 1529121

https://src.fedoraproject.org/rpms/libxml2/pull-request/2

Copy %changelog entry:

* Tue Dec 26 2017 Tomasz Kłoczko <kloczek> - 2.9.5-2
- removed Group fields (https://fedoraproject.org/wiki/Packaging:Guidelines#Tags_and_Sections)
- remove %%defattr from %%files (no longer needed)
- do not build and package libxml2 static library as none of the other packages
  is using static libxml2 librarys (https://fedoraproject.org/wiki/Packaging:Guidelines#Packaging_Static_Libraries)
- removed 2nd copy of the libxml2 API documentation (doc/html it is
  the same as in %%{_datadir}/gtk-doc/html/libxml2) and 3rd copy in source xml
  (devel package is now 30% smaller)
- remove not needed %%ifing
- man pages do not need %%doc token as those files are by definition %%doc
- use %%bcond instead %%global to enable build python3 subpackage
- remove BuildRoot, %%clear section and clean build root on beginning
  %%install as it is no longer needed
- remove static zlib-devel, xz-devel and pkgconfig Requires in devel
  (none of the libxml2 header files is using zlib or xz headers and
  provide .pc file does not mean that package needs pkgconfig)
- remove all <=f25 hacks (f25 is now EOS)
- simplifications in %%files
- add %%{_libdir}/cmake/libxml2 directory to devel %%files
- add use more macros
- simplify build the python3 module (to build python3 module is not necessary to
  rebuild the whole libxml2)
- indent spec
- add use %%{?_isa} macro in Requires
- move man3 man pages to devel