Use SO_REUSEPORT only if it is available on the platform. #1040

Job	Run time
Check codebase format with clang-format	7s
Check c99 compilation	12s
Test examples without router	15s
Build raweth transport on ubuntu-latest	13s
Run unit tests on ubuntu-latest	30s
Build Zenoh from source	5m 44s
Build and test in single thread on ubuntu-latest	34s
Modular build on ubuntu-latest (1, 1, 1, 1)	42s
Test attachments	37s
Test multicast and unicast fragmentation	42s
Modular build on ubuntu-latest (1, 1, 1, 0)	38s
Modular build on ubuntu-latest (1, 1, 0, 1)	41s
Modular build on ubuntu-latest (1, 1, 0, 0)	37s
Modular build on ubuntu-latest (1, 0, 1, 1)	38s
Modular build on ubuntu-latest (1, 0, 1, 0)	34s
Modular build on ubuntu-latest (1, 0, 0, 1)	37s
Modular build on ubuntu-latest (1, 0, 0, 0)	42s
Modular build on ubuntu-latest (0, 1, 1, 1)	25s
Modular build on ubuntu-latest (0, 1, 1, 0)	23s
Modular build on ubuntu-latest (0, 1, 0, 1)	26s
Modular build on ubuntu-latest (0, 1, 0, 0)	20s
Modular build on ubuntu-latest (0, 0, 1, 1)	31s
Modular build on ubuntu-latest (0, 0, 1, 0)	21s
Modular build on ubuntu-latest (0, 0, 0, 1)	24s
Modular build on ubuntu-latest (0, 0, 0, 0)	23s
	17m 16s

Provide feedback