spec/ruby/core/encoding/locale_charmap_spec.rb: locale_charmap is UTF-8 on Android

nl_langinfo(CODESET) always returns UTF-8 on Android, regardless to
LC_ALL=C.

spec/ruby/core/encoding/locale_charmap_spec.rb

@@ -7,6 +7,7 @@ describe "Encoding.locale_charmap" do
 
   # FIXME: Get this working on Windows
   platform_is :linux do
+    platform_is_not :android do
       it "returns a value based on the LC_ALL environment variable" do
         old_lc_all = ENV['LC_ALL']
         ENV['LC_ALL'] = 'C'
@@ -14,6 +15,7 @@ describe "Encoding.locale_charmap" do
         ENV['LC_ALL'] = old_lc_all
       end
     end
+  end
 
   platform_is :freebsd, :openbsd, :darwin do
     it "returns a value based on the LC_ALL environment variable" do
@@ -33,6 +35,15 @@ describe "Encoding.locale_charmap" do
     end
   end
 
+  platform_is :android do
+    it "always returns UTF-8" do
+      old_lc_all = ENV['LC_ALL']
+      ENV['LC_ALL'] = 'C'
+      ruby_exe("print Encoding.locale_charmap").should == 'UTF-8'
+      ENV['LC_ALL'] = old_lc_all
+    end
+  end
+
   platform_is :bsd, :darwin, :linux do
     it "is unaffected by assigning to ENV['LC_ALL'] in the same process" do
       old_charmap = Encoding.locale_charmap