[rubygems/rubygems] Move list of exceptions to the rescue clause

Instead of having to match classes and re-raise in the exception body.

rubygems/rubygems@5edf74b781

lib/rubygems.rb

@@ -1120,15 +1120,10 @@ def self.use_gemdeps(path = nil)
       end
     end
 
-  rescue => e
-    case e
-    when Gem::LoadError, Gem::UnsatisfiableDependencyError, (defined?(Bundler::GemNotFound) ? Bundler::GemNotFound : Gem::LoadError)
-      warn e.message
-      warn "You may need to `gem install -g` to install missing gems"
-      warn ""
-    else
-      raise
-    end
+  rescue Gem::LoadError, Gem::UnsatisfiableDependencyError, (defined?(Bundler::GemNotFound) ? Bundler::GemNotFound : Gem::LoadError) => e
+    warn e.message
+    warn "You may need to `gem install -g` to install missing gems"
+    warn ""
   end
 
   ##