Build failure for riscv32

[Baruch Siach]

Hi strace developers,

Since updating to version 5.2 I see this build failure for riscv32 with
glibc[1]:

.../opt/ext-toolchain/bin/../lib/gcc/riscv32-buildroot-linux-gnu/7.4.0/../../../../riscv32-buildroot-linux-gnu/bin/ld: strace-syscall.o: in function `.LANCHOR1':
syscall.c:(.rodata+0xddc4): undefined reference to `sys_io_getevents_time64'
.../opt/ext-toolchain/bin/../lib/gcc/riscv32-buildroot-linux-gnu/7.4.0/../../../../riscv32-buildroot-linux-gnu/bin/ld: syscall.c:(.rodata+0xe558): undefined reference to `sys_nanosleep_time64'
.../opt/ext-toolchain/bin/../lib/gcc/riscv32-buildroot-linux-gnu/7.4.0/../../../../riscv32-buildroot-linux-gnu/bin/ld: syscall.c:(.rodata+0xead0): undefined reference to `sys_adjtimex64'

All these functions are not defined when HAVE_ARCH_OLD_TIME64_SYSCALLS
is 0, as is the case for riscv32.

How should that be fixed?

Thanks,
baruch

[1] https://github.com/riscv/riscv-glibc branch 'riscv-glibc-2.29'

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