Drop upstreamed patch

ORBit2.spec

@@ -15,8 +15,6 @@ BuildRequires: glib2-devel >= %{glib2_version}
 BuildRequires: pkgconfig >= 0.14
 BuildRequires: gtk-doc >= 1.1
 
-Patch0: ORBit2-2.12.1-reduce-size-of-io-thread-stack.patch
-
 %description
 ORBit is a high-performance CORBA (Common Object Request Broker 
 Architecture) ORB (object request broker). It allows programs to 
@@ -51,8 +49,6 @@ write such programs, you'll also need to install the ORBIT package.
 %prep
 %setup -q
 
-%patch0 -p1 -b .reduce-size-of-io-thread-stack
-
 %build
 %configure --enable-gtk-doc
 make