Make string literal to frozen object on gemspec of defulte gems.

Added following gemspecs.

    * extensions: date, dbm, etc, fiddle, gdbm, sdbm, stringio, strscan, zlib
    * pure ruby libraries: cmath, csv, fileutils, scanf, webrick

  psych and rdoc is out of scope of this commit. I will merge after
  upstream was change to `frozen_string_literal: true`.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59115 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/date/date.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "date"
   s.version = '0.0.1'

ext/dbm/dbm.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "dbm"
   s.version = '0.5.1'

ext/etc/etc.gemspec

@@ -1,4 +1,5 @@
 # coding: utf-8
+# frozen_string_literal: true
 
 Gem::Specification.new do |spec|
   spec.name          = "etc"

ext/fiddle/fiddle.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |spec|
   spec.name          = "fiddle"
   spec.version       = '1.0.0.beta1'

ext/gdbm/gdbm.gemspec

@@ -1,4 +1,5 @@
 # coding: utf-8
+# frozen_string_literal: true
 
 Gem::Specification.new do |spec|
   spec.name          = "gdbm"

ext/sdbm/sdbm.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "sdbm"
   s.version = '0.0.1'

ext/stringio/stringio.gemspec

@@ -1,4 +1,5 @@
 # -*- encoding: utf-8 -*-
+# frozen_string_literal: true
 # stub: stringio 0.0.0 ruby lib
 # stub: extconf.rb
 

ext/strscan/strscan.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "strscan"
   s.version = '0.0.1'

ext/zlib/zlib.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "zlib"
   s.version = '0.0.1'

lib/cmath.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "cmath"
   s.version = '0.0.1'

lib/csv.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "csv"
   s.version = '0.0.1'

lib/fileutils.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "fileutils"
   s.version = '0.7.2'

lib/scanf.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Gem::Specification.new do |s|
   s.name = "scanf"
   s.version = '0.0.1'

lib/webrick/webrick.gemspec

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 $LOAD_PATH.unshift File.expand_path('../lib', __FILE__)
 require 'webrick/version'