proper path resolving fix for CPACK RPM bug

cmake/tarantool_cpack.cmake

@@ -11,6 +11,8 @@ if ("${CPACK_GENERATOR}" STREQUAL "RPM")
     set (CPACK_RPM_PACKAGE_LICENSE "BSD")
     set (CPACK_RPM_PACKAGE_GROUP "MAIL.RU")
     set (CPACK_RPM_PACKAGE_DESCRIPTION "Tarantool in-memory DB storage")
+    set (CPACK_SET_DESTDIR "ON") 
+    set (CPACK_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
 else()
     set (CPACK_GENERATOR "TGZ")
 endif()