Package rpm-build: Information

- cpio.c: Fixed the conversion of 8-digit hex file sizes from cpio header.
  Packages with a 2GB+ file should now be installable.

- Implemented limited support for large files: a 2GB+ file can now be packaged,
  but the total size of uncompressed cpio payload is capped at 4 GB.
- Automatically downgrade LZMA compression levels 7-9 -> 6 on small payloads.

- imz@:
  + Turned on running %__find_{conflicts,obsoletes} if they are defined.
  + shell.req.files: included #!/usr/bin/env sh.
  + verify-elf: allowed standalone use (without failing due to grep's status).
- macro.c: increased maximal macro depth.
- Introduced %_libsuff and %_is_libsuff macros.
- Added support of mips{,n32,64}{,el}, riscv64, and s390x targets.
- Added non-lfs symbols from librt.so.1 library to verify_lfs check.
- Filtered string functions from the list of non-lfs symbols.