libglade2-2.6.4-160000.3.2

- remove dependency on /usr/bin/python3 using
  %python3_fix_shebang macro, [bsc#1212476]

- Use %autosetup instead of %setup/%patch.

- Drop baselibs.conf: there is no known consumer of the -32bit
  package.

- Normalize patch tag line.

- Add gtk-doc BuildRequires: if configure.ac contains
  GTK_DOC_CHECK, autoconf 2.70+ implicilty wants to start
  gtkdocize.

- Remove ineffective --with-pic.

- Modernize spec-file by calling spec-cleaner

- Switch to python3:
  + Add libglade2-python3.patch: convert libglade-convert to a
    python3 program.
  + Export PYTHON=/usr/bin/python3 before calling configure.
  + Replace python-devel and python-xml BuildRequires with
    python3-devel and python3-xml.
  + Add libtool BuildRequires and call to autoreconf: the currently
    bootstrapped configure script can't cope with python3 version
    comparison.

- Spec-cleanup using format_spec_file service.

- Update packaging to use the shared library packaging policy:
  + Create libglade-2_0-0 subpackage.
  + Add Provides/Obsoletes for libglade2 to libglade-2_0-0.
  + Update baselibs.conf accordingly.
- Remove explicit Requires of devel packages in devel subpackage:
  they will be added automatically the pkgconfig() way.