healpix-3.81-bp156.2.8

- Update to version 3.81:
  * Cfitsio 4.0.0 (Jul 2021) and higher now properly supported.
  * Introduced workarounds for some minor GDL and FL limitations.
- New BuildRequires: pkgconfig(zlib) and also Requires for c++
  devel package.
- Drop healpix-cfitsio-version-format-change.patch: incorporated
  upstream.

- Update to version 3.80:
  * General:
  - addition of SHARP_PARAL and CXX_PARAL to control the
    parallel implementation of the libsharp library and C++
    library and codes.
  - PYTHON now defaults to python3.
  * C++:
  - the line-integral convolution interface is now accessible
    not only from the command line, but also via C++ calls, to
    allow calling from healpy.
  - some internals were restructured to allow easier integration
    with SWIG.
  * Fortran 90 facilities and subroutines:
  - Improvement of query_disc routine in inclusive mode.
  - The routines alm2map_spin and map2alm_spin now accept any
    (integer) spin values |s|>=0, but the scalar routines
    alm2map and map2alm are still recommended for vanishing spin
    (s=0).
  - Correction of bugs preventing the compilation with versions
    10.* of gfortran.
  - Fixed bug affecting map2gif when compiled with versions 10.*
    of gfortran and gcc.
- Add healpix-cfitsio-version-format-change.patch -- Adapt to new
  three-number version format of cfitsio
  [https://sourceforge.net/p/healpix/bugs/122/].

- Use _service file to build source tarball from svn repo directly
  while omitting idl source files: this avoids licensing issues
  that the idl source files carry.

- Initial package