Skip the spec which uses `fork` on Windows

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/rubyspec/optional/capi/kernel_spec.rb

@@ -389,23 +389,25 @@ describe "C-API Kernel function" do
     end
   end
 
-  describe "rb_set_end_proc" do
-    before :each do
-      @r, @w = IO.pipe
-    end
+  platform_is_not :windows do
+    describe "rb_set_end_proc" do
+      before :each do
+        @r, @w = IO.pipe
+      end
 
-    after :each do
-      @r.close
-      @w.close
-      Process.wait @pid
-    end
+      after :each do
+        @r.close
+        @w.close
+        Process.wait @pid
+      end
 
-    it "runs a C function on shutdown" do
-      @pid = fork {
-        @s.rb_set_end_proc(@w)
-      }
+      it "runs a C function on shutdown" do
+        @pid = fork {
+          @s.rb_set_end_proc(@w)
+        }
 
-      @r.read(1).should == "e"
+        @r.read(1).should == "e"
+      end
     end
   end