Package cross-toolchain-loongarch64-linux-gnu: Information

- GCC:
  + Use gcc-source 13.2.1.0.21.d99aee70bd7-20230729 from sisyphus_loongarch64.
    This includes LoongArch SIMD patches from
    https://github.com/loongson/gcc.git
    branch loongarch-gcc-vector
    commit 14ecbfa78ebdd9c8921517ed4354e64e96cda564
- spec: ship compressed sources in src.rpm (take less space when building)

- binutils: updated to version 2.41. Required for SIMD and virtualization support.

- GCC: updated to release 13.2.0
- glibc: use ALT glibc 2.38 with sisyphus_loongarch64 patches
- spec: integrated aarch64 bits for glibc 2.38 packaging
- spec: integrated mips64el bits