eclass/cmake-utils: switch Darwin to rpath mode, bug #642668

By Michael Weiser, relying on the other support that enables @rpath
entries, supported in macOS 10.5 and up.

Closes: https://bugs.gentoo.org/642668

eclass/cmake-utils.eclass

@@ -586,12 +586,10 @@ cmake-utils_src_configure() {
 			ELSE ()
 
 			SET(CMAKE_PREFIX_PATH "${EPREFIX}/usr" CACHE STRING "" FORCE)
+			SET(CMAKE_MACOSX_RPATH ON CACHE BOOL "" FORCE)
 			SET(CMAKE_SKIP_BUILD_RPATH OFF CACHE BOOL "" FORCE)
 			SET(CMAKE_SKIP_RPATH OFF CACHE BOOL "" FORCE)
-			SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE CACHE BOOL "")
-			SET(CMAKE_INSTALL_RPATH "${EPREFIX}/usr/lib;${EPREFIX}/usr/${CHOST}/lib/gcc;${EPREFIX}/usr/${CHOST}/lib;${EPREFIX}/usr/$(get_libdir);${EPREFIX}/$(get_libdir)" CACHE STRING "" FORCE)
 			SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE CACHE BOOL "" FORCE)
-			SET(CMAKE_INSTALL_NAME_DIR "${EPREFIX}/usr/lib" CACHE STRING "" FORCE)
 
 			ENDIF (NOT APPLE)
 		_EOF_