unix: add Major, Minor and Mkdev functions on Solaris

Add Major, Minor and Mkdev functions for converting device numbers to
their major/minor components and vice versa.

Use the respective functions provided by the Solaris libc instead of
reimplementing them.

Test the conversion function with some well-known static device numbers
for devices which should be present on any Solaris system.

Re-generated files on OpenIndiana Hipster 2017.04 (SunOS 5.11) which
also added some previously missing error constants.

Change-Id: Ief9ea973d91c24956571eb8fafc8a4525b0f5b90
Reviewed-on: https://go-review.googlesource.com/64390
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/syscall_solaris.go

@@ -514,6 +514,24 @@ func Acct(path string) (err error) {
 	return acct(pathp)
 }
 
+//sys	__makedev(version int, major uint, minor uint) (val uint64)
+
+func Mkdev(major, minor uint32) uint64 {
+	return __makedev(NEWDEV, uint(major), uint(minor))
+}
+
+//sys	__major(version int, dev uint64) (val uint)
+
+func Major(dev uint64) uint32 {
+	return uint32(__major(NEWDEV, dev))
+}
+
+//sys	__minor(version int, dev uint64) (val uint)
+
+func Minor(dev uint64) uint32 {
+	return uint32(__minor(NEWDEV, dev))
+}
+
 /*
  * Expose the ioctl function
  */