Package gcc: Changelog

- Install LTO linker plugin for BFD.

- Changed default compiler to gcc10.
- gcc: added lto-dump symlinks.

- Added libquadmath-devel-static subpackage.

- Added gcc-gdc metapacakge.
- Dropped libmpx-devel-static subpackage.

- Added ppc64le (ALT#37086) and riscv64 support.
- Added gcc-gdb-plugin subpackage.

- Changed default gcc version to 8.
- Dropped libcilkrts-* subpackages.

- Fixed installation (with rpm --excludedocs option) of subpackages containing
  symlinks on gcc manpages (ALT#34996).

- (.spec) Made possible to disable noarch subpkgs.
- More specific Group for gcc-c++. (ALT#34901)
- Filled URL. (ALT#34624)

- aarch64: packaged liblsan-devel-static and libtsan-devel-static.

- Upgraded Conflicts tags.

- gcc-fortran: provide gcc-g77.
- Fixed conditional packaging of subpackages.
- Fixed symlinks.
- Made arch-agnostic dependency packages noarch.

- Initial build.