riscv32: fix missing and extraneous items in syscall table

nanosleep is a time32 syscall which riscv32 lacks by being natively
time64. the erroneous macro being present did not break anything libc
internal, because SYS_nanosleep is never used in the natively-time64
path, but i could in theory cause applications to wrongly attempt to
use it if they do their own syscalls. it has wrongly been there since
the riscv32 port was added.

close_range and quotactl_fd were somehow omitted in commit
8432d16a4664433b2f9a263aee0d7d829129a7bc.