dev-ruby/haml: remove unused patch.

Closes: https://github.com/gentoo/gentoo/pull/2417

Signed-off-by: Patrice Clement <monsieurp@gentoo.org>

dev-ruby/haml/files/haml-3.1.6-sass.patch

@@ -1,20 +0,0 @@
---- metadata.orig	2012-07-03 07:46:35.000000000 +0200
-+++ metadata	2012-07-03 07:51:30.917926913 +0200
-@@ -14,6 +14,17 @@
- date: 2012-05-16 00:00:00.000000000 Z
- dependencies:
- - !ruby/object:Gem::Dependency
-+  name: sass
-+  prerelease: false
-+  requirement: &id003 !ruby/object:Gem::Requirement 
-+    none: false
-+    requirements: 
-+    - - "~>"
-+      - !ruby/object:Gem::Version 
-+        version: 3.2.0
-+  type: :runtime
-+  version_requirements: *id003
-+- !ruby/object:Gem::Dependency 
-   name: yard
-   requirement: !ruby/object:Gem::Requirement
-     none: false