Add MIPS32 cross compilation, refactor existing cross-compilation jobs #2

Job	Run time
mips-32, Shared, OpenSSL, Threadpool On	6m 1s
mips-32, Shared, OpenSSL, Threadpool Off	5m 59s
mips-32, Shared, MbedTLS, Threadpool On	3m 42s
mips-32, Shared, MbedTLS, Threadpool Off	3m 40s
mips-32, Static, OpenSSL, Threadpool On	6m 6s
mips-32, Static, OpenSSL, Threadpool Off	6m 1s
mips-32, Static, MbedTLS, Threadpool On	3m 14s
mips-32, Static, MbedTLS, Threadpool Off	3m 5s
arm-32, Shared, OpenSSL, Threadpool On	6m 12s
arm-32, Shared, OpenSSL, Threadpool Off	6m 9s
arm-32, Shared, MbedTLS, Threadpool On	3m 36s
arm-32, Shared, MbedTLS, Threadpool Off	3m 47s
arm-32, Static, OpenSSL, Threadpool On	5m 58s
arm-32, Static, OpenSSL, Threadpool Off	5m 48s
arm-32, Static, MbedTLS, Threadpool On	3m 37s
arm-32, Static, MbedTLS, Threadpool Off	3m 6s
arm-64, Shared, OpenSSL, Threadpool On	6m 11s
arm-64, Shared, OpenSSL, Threadpool Off	6m 12s
arm-64, Shared, MbedTLS, Threadpool On	3m 56s
arm-64, Shared, MbedTLS, Threadpool Off	4m 4s
arm-64, Static, OpenSSL, Threadpool On	6m 16s
arm-64, Static, OpenSSL, Threadpool Off	6m 11s
arm-64, Static, MbedTLS, Threadpool On	3m 17s
arm-64, Static, MbedTLS, Threadpool Off	3m 10s
aarch-64, Shared, OpenSSL, Threadpool On	6m 47s
aarch-64, Shared, OpenSSL, Threadpool Off	6m 4s
aarch-64, Shared, MbedTLS, Threadpool On	4m 12s
aarch-64, Shared, MbedTLS, Threadpool Off	3m 36s
aarch-64, Static, OpenSSL, Threadpool On	6m 28s
aarch-64, Static, OpenSSL, Threadpool Off	5m 55s
aarch-64, Static, MbedTLS, Threadpool On	3m 37s
aarch-64, Static, MbedTLS, Threadpool Off	3m 11s
	2h 35m 8s

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