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/zerrors_solaris_amd64.go

@@ -664,6 +664,8 @@ const (
 	MS_OLDSYNC                    = 0x0
 	MS_SYNC                       = 0x4
 	M_FLUSH                       = 0x86
+	NAME_MAX                      = 0xff
+	NEWDEV                        = 0x1
 	NL0                           = 0x0
 	NL1                           = 0x100
 	NLDLY                         = 0x100
@@ -672,6 +674,9 @@ const (
 	OFDEL                         = 0x80
 	OFILL                         = 0x40
 	OLCUC                         = 0x2
+	OLDDEV                        = 0x0
+	ONBITSMAJOR                   = 0x7
+	ONBITSMINOR                   = 0x8
 	ONLCR                         = 0x4
 	ONLRET                        = 0x20
 	ONOCR                         = 0x10
@@ -1105,6 +1110,7 @@ const (
 	VEOL                          = 0x5
 	VEOL2                         = 0x6
 	VERASE                        = 0x2
+	VERASE2                       = 0x11
 	VINTR                         = 0x0
 	VKILL                         = 0x3
 	VLNEXT                        = 0xf