Snippets for stress-ng 0.22.00 from Alpine riscv64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-riscv64/community/stress-ng/stress-ng-0.22.00-r0.log.

• /usr/include/sys/cdefs.h:4:2: warning: #warning usage of non-standard #include <sys/cdefs.h> is deprecated [-Wcpp]
      4 | #warning usage of non-standard #include <sys/cdefs.h> is deprecated
        |  ^~~~~~~
  

• core-builtin.h:35:41: warning: '__builtin_memset' forming offset 16384 is out of the bounds [0, 16384] of object 'buf' with type 'char[16384]' [-Warray-bounds=]
     35 | #define shim_memset(s, c, n)            __builtin_memset((s), (c), (n))
        |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~