lang/gcc breaks on scc.h on newer Linux

["Sijmen J. Mulder" <ik%sjmulder.nl@localhost>]

GCC 14 fails on my Debian with kernel 7.1.8 from backports:

../../../../gcc-14.3.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cpp:154:10: 
fatal error: linux/scc.h: No such file or directory
  154 | #include <linux/scc.h>
      |          ^~~~~~~~~~~~~

The file was removed in Linux:

https://github.com/torvalds/linux/commit/64edfa65062dc4509ba75978116b2f6d392346f5

LLM more or less simply removed its inclusion:

  https://github.com/llvm/llvm-project/pull/194116

I don't know if GCC upstream has done the same, or that we should patch 
our package(s). I could, but considering we're in "careful mode" and I 
haven't touched GCC before, I thought I'd check in first.

Sijmen