all: update to Unicode 11

This does *not* update the vendored tables.
A commit updating these tables should follow soon,

Mostly generated running UNICODE_VERSION=11.0.0 in x/text.

Manually updated next.txt file.

Updates #27945.

Change-Id: I939a01e235aeca898ee9afc99a531e7ad8444e12
Reviewed-on: https://go-review.googlesource.com/c/go/+/154420
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

Author: mpvl

api/except.txt

@@ -457,4 +457,5 @@ pkg syscall (freebsd-arm-cgo), type Stat_t struct, Nlink uint16
 pkg syscall (freebsd-arm-cgo), type Stat_t struct, Rdev uint32
 pkg syscall (freebsd-arm-cgo), type Statfs_t struct, Mntfromname [88]int8
 pkg syscall (freebsd-arm-cgo), type Statfs_t struct, Mntonname [88]int8
-pkg text/scanner, const GoTokens = 1012
+pkg text/scanner, const GoTokens = 1012
+pkg unicode, const Version = "10.0.0"

api/next.txt

@@ -1,3 +1,11 @@
 pkg text/scanner, const AllowNumberbars = 1024
 pkg text/scanner, const AllowNumberbars ideal-int
 pkg text/scanner, const GoTokens = 2036
+pkg unicode, const Version = "11.0.0"
+pkg unicode, var Dogra *RangeTable
+pkg unicode, var Gunjala_Gondi *RangeTable
+pkg unicode, var Hanifi_Rohingya *RangeTable
+pkg unicode, var Makasar *RangeTable
+pkg unicode, var Medefaidrin *RangeTable
+pkg unicode, var Old_Sogdian *RangeTable
+pkg unicode, var Sogdian *RangeTable