update test:examples to libiconv 1.15

because 1.14 wasn't running on windows rubies 2.4+ due to what appears
to be an outdated config.guess. I could have downloaded or patched with
an updated config.guess, but this seemed easier and didn't decrease test
coverage meaningfully.

examples/Rakefile

@@ -10,20 +10,19 @@ def windows?
 end
 
 # libiconv
-libiconv = MiniPortile.new "libiconv", "1.14"
+libiconv = MiniPortile.new "libiconv", "1.15"
 libiconv.files << "ftp://ftp.gnu.org/pub/gnu/#{libiconv.name}/#{libiconv.name}-#{libiconv.version}.tar.gz"
-unless windows?
-  libiconv.patch_files = Dir["libiconv-patches/*.patch"].map { |dir| File.expand_path dir }
-end
 
 recipes.push libiconv
 
+
 # sqlite3
 sqlite3 = MiniPortile.new "sqlite3", "3.8.4.1"
 sqlite3.files << "http://sqlite.org/2014/sqlite-autoconf-3080401.tar.gz"
 
 recipes.push sqlite3
 
+
 # c-ares
 c_ares = MiniPortile.new "c-ares", "1.7.5"
 c_ares.files << {
@@ -33,6 +32,7 @@ c_ares.files << {
 
 recipes.push c_ares
 
+
 # zlib
 class ZlibRecipe < MiniPortile
   def windows?
@@ -92,9 +92,9 @@ zlib.files << {
   md5: "44d667c142d7cda120332623eab69f40",
 }
 
-
 recipes.push zlib
 
+
 namespace :ports do
   directory "ports"
 
@@ -123,6 +123,7 @@ namespace :ports do
   end
 end
 
+
 desc "Adjust all recipes host for cross-compilation"
 task :cross do
   recipes.each do |recipe|