Remove useless patch.

activesupport-add-bigdecimal-dependency.patch

@@ -1,19 +0,0 @@
---- a/specifications/activesupport-3.2.13.gemspec.orig	2012-07-18 14:52:50.000000000 +0200
-+++ b/specifications/activesupport-3.2.13.gemspec	2012-07-18 14:56:49.367668024 +0200
-@@ -20,13 +20,16 @@
-     s.specification_version = 4
- 
-     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
-+      s.add_runtime_dependency(%q<bigdecimal>, [">= 0"])
-       s.add_runtime_dependency(%q<i18n>, ["= 0.6.1"])
-       s.add_runtime_dependency(%q<multi_json>, ["~> 1.0"])
-     else
-+      s.add_dependency(%q<bigdecimal>, [">= 0"])
-       s.add_dependency(%q<i18n>, ["= 0.6.1"])
-       s.add_dependency(%q<multi_json>, ["~> 1.0"])
-     end
-   else
-+    s.add_dependency(%q<bigdecimal>, [">= 0"])
-     s.add_dependency(%q<i18n>, ["= 0.6.1"])
-     s.add_dependency(%q<multi_json>, ["~> 1.0"])
-   end