Add MIPS32 cross compilation, refactor existing cross-compilation jobs #1

Job	Run time
mips-32, Shared, OpenSSL, Threadpool On	5m 37s
mips-32, Shared, OpenSSL, Threadpool Off	5m 40s
mips-32, Shared, MbedTLS, Threadpool On	3m 9s
mips-32, Shared, MbedTLS, Threadpool Off	2m 58s
mips-32, Static, OpenSSL, Threadpool On	5m 33s
mips-32, Static, OpenSSL, Threadpool Off	5m 33s
mips-32, Static, MbedTLS, Threadpool On	2m 42s
mips-32, Static, MbedTLS, Threadpool Off	2m 52s
arm-32, Shared, OpenSSL, Threadpool On	5m 49s
arm-32, Shared, OpenSSL, Threadpool Off	5m 30s
arm-32, Shared, MbedTLS, Threadpool On	3m 12s
arm-32, Shared, MbedTLS, Threadpool Off	3m 13s
arm-32, Static, OpenSSL, Threadpool On	5m 24s
arm-32, Static, OpenSSL, Threadpool Off	5m 23s
arm-32, Static, MbedTLS, Threadpool On	2m 42s
arm-32, Static, MbedTLS, Threadpool Off	2m 53s
arm-64, Shared, OpenSSL, Threadpool On	5m 39s
arm-64, Shared, OpenSSL, Threadpool Off	5m 22s
arm-64, Shared, MbedTLS, Threadpool On	3m 3s
arm-64, Shared, MbedTLS, Threadpool Off	3m 27s
arm-64, Static, OpenSSL, Threadpool On	5m 35s
arm-64, Static, OpenSSL, Threadpool Off	5m 35s
arm-64, Static, MbedTLS, Threadpool On	2m 30s
arm-64, Static, MbedTLS, Threadpool Off	2m 51s
aarch-64, Shared, OpenSSL, Threadpool On	5m 36s
aarch-64, Shared, OpenSSL, Threadpool Off	5m 41s
aarch-64, Shared, MbedTLS, Threadpool On	3m 3s
aarch-64, Shared, MbedTLS, Threadpool Off	3m 21s
aarch-64, Static, OpenSSL, Threadpool On	5m 33s
aarch-64, Static, OpenSSL, Threadpool Off	5m 18s
aarch-64, Static, MbedTLS, Threadpool On	3m 4s
aarch-64, Static, MbedTLS, Threadpool Off	2m 31s
	2h 16m 19s

Provide feedback