Fix build after cyclades driver removal in linux >= 5.12

The cyclades driver got removed in linux 5.12: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/include/uapi/linux?h=v5.12&id=f76edd8f7ce06cdff2fe5b6b39a49644c684a161

The linux/cyclades.h header is thus no longer exported, yielding this error:

/usr/src/packages/BUILD/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp:133:10: fatal error: linux/cyclades.h: No such file or directory
  133 | #include <linux/cyclades.h>
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.

See also:

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=995045
• https://salsa.debian.org/pkg-llvm-team/llvm-toolchain/-/commit/91820145ac2b1