poco: Link with libatomic on riscv32
poco: Link with libatomic on riscv32

It does not have compiler intrinsics for 64bit atomics
Fixes
 MetricsSample.cpp:(.text._ZN16MetricsSampleApp4mainERKNSt3__16vectorINS0_12basic_stringIcNS0_11char_t
raitsIcEENS0_9allocatorIcEEEENS5_IS7_EEEE[_ZN16MetricsSampleApp4mainERKNSt3__16vectorINS0_12basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEENS5_IS7_EEEE]+0x104): undefined reference to `__atomic_compare_exchange_8'

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded