libspf2-1.2.10-5.1

- 0001-spf_compile.c-Correct-size-of-ds_avail.patch: fix remote overflow in SPF parsing
  CVE-2021-20314 bsc#1189104

- remove the spfd binary, overlaps with sle

- Use -std=gnu89, logging macros are broken when __STDC_VERSION__ >= 199901L
  is true, which is the case when using GCC5.

- Rename spf2 to libspf2-tools (like we do for e.g. libwmf-tools)
- Move README file to tools subpackage. Trim description of SRPM
  a bit.

- Package LICENSES file as doc.

- Rename the spfquery binary to spf_query to avoid a conflict with the
  perl-Mail-SPF package.

- Exclude static binaries and shift the remaining into the spf2 package.

- Add -n libspf2-2 as arguments to post and postun.

- initial package (version 1.2.10)