Port mksyscall_solaris.pl Perl script to mksyscall_solaris.go.
mkall.sh script is modified to run mksyscall_solaris.go. Running
mkall.sh does not generate any git diff besides the command
name in comments of generated files.

Updates golang/go#27779

Change-Id: I773c9732a882780400a06f578c00e455e133231b
Reviewed-on: https://go-review.googlesource.com/c/162277
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>