software: Implement serial port detection

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+# go-select
+
+select(2) implementation in Go
+
+## Supported platforms
+
+|               | 386 | amd64 | arm | arm64 | mips | mipsle | mips64 | mips64le | ppc64le | s390x |
+|---------------|-----|-------|-----|-------|------|--------|--------|----------|---------|-------|
+| **linux**     | yes | yes   | yes | yes   | yes  | yes    | yes    | yes      | yes     | yes   |
+| **darwin**    | yes | yes   | ??  | ??    | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **freebsd**   | yes | yes   | yes | n/a   | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **openbsd**   | yes | yes   | yes | n/a   | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **netbsd**    | yes | yes   | yes | n/a   | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **dragonfly** | n/a | yes   | n/a | n/a   | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **solaris**   | n/a | no    | n/a | n/a   | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **plan9**     | no  | no    | no  | n/a   | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **windows**   | yes | yes   | n/a | n/a   | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+| **android**   | ??  | ??    | ??  | ??    | n/a  | n/a    | n/a    | n/a      | n/a     | n/a   |
+
+*n/a: platform not supported by Go
+*??: not tested
+
+Go on `plan9` and `solaris` do not implement `syscall.Select` nor `syscall.SYS_SELECT`.
+
+## Cross compile test
+
+Note that this only tests the compilation, not the functionality.
+
+```sh
+$> ./test_crosscompile.sh > /dev/null | sort
+[OK] android/386
+[OK] android/amd64
+[OK] android/arm
+[OK] android/arm64
+[OK] darwin/386
+[OK] darwin/amd64
+[OK] darwin/arm
+[OK] darwin/arm64
+[OK] dragonfly/amd64
+[OK] freebsd/386
+[OK] freebsd/amd64
+[OK] freebsd/arm
+[OK] linux/386
+[OK] linux/amd64
+[OK] linux/arm
+[OK] linux/arm64
+[OK] linux/mips
+[OK] linux/mips64
+[OK] linux/mips64le
+[OK] linux/mipsle
+[OK] linux/ppc64le
+[OK] linux/s390x
+[OK] netbsd/386
+[OK] netbsd/amd64
+[OK] netbsd/arm
+[OK] openbsd/386
+[OK] openbsd/amd64
+[OK] openbsd/arm
+[OK] plan9/386
+[OK] plan9/amd64
+[OK] plan9/arm
+[OK] solaris/amd64
+[OK] windows/386
+[OK] windows/amd64
+[OK] windows/arm
+
+# Expected failures.
+[KO] android/mips
+[KO] android/mips64
+[KO] android/mips64le
+[KO] android/mipsle
+[KO] android/ppc64le
+[KO] android/s390x
+[KO] darwin/mips
+[KO] darwin/mips64
+[KO] darwin/mips64le
+[KO] darwin/mipsle
+[KO] darwin/ppc64le
+[KO] darwin/s390x
+[KO] dragonfly/386
+[KO] dragonfly/arm
+[KO] dragonfly/arm64
+[KO] dragonfly/mips
+[KO] dragonfly/mips64
+[KO] dragonfly/mips64le
+[KO] dragonfly/mipsle
+[KO] dragonfly/ppc64le
+[KO] dragonfly/s390x
+[KO] freebsd/arm64
+[KO] freebsd/mips
+[KO] freebsd/mips64
+[KO] freebsd/mips64le
+[KO] freebsd/mipsle
+[KO] freebsd/ppc64le
+[KO] freebsd/s390x
+[KO] netbsd/arm64
+[KO] netbsd/mips
+[KO] netbsd/mips64
+[KO] netbsd/mips64le
+[KO] netbsd/mipsle
+[KO] netbsd/ppc64le
+[KO] netbsd/s390x
+[KO] openbsd/arm64
+[KO] openbsd/mips
+[KO] openbsd/mips64
+[KO] openbsd/mips64le
+[KO] openbsd/mipsle
+[KO] openbsd/ppc64le
+[KO] openbsd/s390x
+[KO] plan9/arm64
+[KO] plan9/mips
+[KO] plan9/mips64
+[KO] plan9/mips64le
+[KO] plan9/mipsle
+[KO] plan9/ppc64le
+[KO] plan9/s390x
+[KO] solaris/386
+[KO] solaris/arm
+[KO] solaris/arm64
+[KO] solaris/mips
+[KO] solaris/mips64
+[KO] solaris/mips64le
+[KO] solaris/mipsle
+[KO] solaris/ppc64le
+[KO] solaris/s390x
+[KO] windows/arm64
+[KO] windows/mips
+[KO] windows/mips64
+[KO] windows/mips64le
+[KO] windows/mipsle
+[KO] windows/ppc64le
+[KO] windows/s390x
+```
+
+## License
+
+Released under the [MIT license](LICENSE).