add installed rpath to openvkl to make SB's build run as is

Without this the runtime module loading fails without path
modifications. The ctest -R cpack'd install has the
correct package relative rpath regardless.

projects/openvkl.cmake

@@ -7,3 +7,5 @@ superbuild_add_project(openvkl
     -DCMAKE_INSTALL_NAME_DIR:PATH=<INSTALL_DIR>/lib
     -DCMAKE_INSTALL_LIBDIR:STRING=lib
     -DISPC_EXECUTABLE:PATH=<INSTALL_DIR>/bin/ispc)
+
+superbuild_apply_patch(openvkl install-rpath "make rpath for superbuild to modify")

projects/patches/openvkl-install-rpath.patch

+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1aef5d9..eb5d9ca 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -21,6 +21,15 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+ 
+ project(openvkl VERSION 0.11.0 LANGUAGES C CXX)
+ 
++#put rpath into install tree for ParaViewSB to fixup after
++set(CMAKE_SKIP_INSTALL_RPATH OFF)
++if (APPLE)
++  set(CMAKE_MACOSX_RPATH ON)
++  set(CMAKE_INSTALL_RPATH "@executable_path/" "@executable_path/../${CMAKE_INSTALL_LIBDIR}")
++else()
++  set(CMAKE_INSTALL_RPATH "\$ORIGIN:\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}")
++endif()
++
+ ## Add openvkl specific macros ##
+ 
+ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${PROJECT_SOURCE_DIR}/cmake)