[Toybox] [PATCH] strace.c: add risc-v support, fix non-legacy architectures.

[enh]

The man page's threat that not all architectures will have PTRACE_GETREGS
is true... Also #if more optional legacy system calls and arguments, add
getrandom() flag decoding, and remove a stray unused global.
---
 toys/pending/strace.c | 51 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 13 deletions(-)
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