Remove non-applicable changes from cmake patch

* This line should not have been changed, it's inside an "ifdef(APPLE"
  block anyway, but removing it all the same.
diff --git a/contrib/packages/rpm/el5/SOURCES/fltk-1.3.2-libdl.patch b/contrib/packages/rpm/el5/SOURCES/fltk-1.3.2-libdl.patch
index 0d07340..78c8fd4 100644
--- a/contrib/packages/rpm/el5/SOURCES/fltk-1.3.2-libdl.patch
+++ b/contrib/packages/rpm/el5/SOURCES/fltk-1.3.2-libdl.patch
@@ -3,14 +3,6 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
 --- a/CMakeLists.txt	(revision 9965)
 +++ b/CMakeLists.txt	(working copy)
-@@ -52,6 +52,7 @@
-    set(HAVE_STRCASECMP 1)
-    set(HAVE_DIRENT_H 1)
-    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -framework Cocoa")
-+   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -framework Cocoa")
- endif(APPLE)
- 
- if(WIN32)
 @@ -138,6 +139,7 @@
  #######################################################################
  # libraries