[evolution] Allow overwrite of CMAKE_SKIP_RPATH variable

[Milan Crha <mcrha src gnome org>]

commit e84b3346e78353111b2089e3ee65f33ed45176c6
Author: Milan Crha <mcrha redhat com>
Date:   Thu Jun 15 13:52:38 2017 +0200

    Allow overwrite of CMAKE_SKIP_RPATH variable

 CMakeLists.txt |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4dbd2d5..0b9d0ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -98,7 +98,7 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 # Packagers might want to need different settings for the RPATH related things
 # From experience, especially CMAKE_BUILD_WITH_INSTALL_RPATH might need to be
 # switched to ON, if CMake fails to set the right values during make install
-set(CMAKE_SKIP_RPATH OFF)
+set(CMAKE_SKIP_RPATH OFF CACHE BOOL INTERNAL)
 set(CMAKE_SKIP_BUILD_RPATH OFF CACHE BOOL INTERNAL)
 set(CMAKE_BUILD_WITH_INSTALL_RPATH OFF CACHE BOOL INTERNAL)
 set(CMAKE_INSTALL_RPATH_USE_LINK_PATH ON CACHE BOOL INTERNAL)