Multiarch installation fix (#567)

* fix multiarch install

* fix include dir

* cleaned up stuff and removed things we don't need anymore

dlib/CMakeLists.txt

@@ -749,7 +749,6 @@ if (NOT TARGET dlib)
             NAMESPACE dlib::
             DESTINATION ${ConfigPackageLocation})
 
-       set(CONF_INSTALL_PATH "\${dlib_CMAKE_DIR}/../../../")
        configure_file(cmake_utils/dlibConfig.cmake.in "${CMAKE_CURRENT_BINARY_DIR}/config/dlibConfig.cmake" @ONLY)
 
        include(CMakePackageConfigHelpers)

dlib/cmake_utils/dlibConfig.cmake.in

@@ -19,24 +19,18 @@
 # ===================================================================================
 
 
-# Compute paths
-get_filename_component(dlib_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
 
-if(${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} VERSION_LESS 2.8)
-    get_filename_component(dlib_INSTALL_PATH "@CONF_INSTALL_PATH@" ABSOLUTE)
-else()
-    get_filename_component(dlib_INSTALL_PATH "@CONF_INSTALL_PATH@" REALPATH)
-endif()
-
-set(dlib_INCLUDE_DIRS "${dlib_INSTALL_PATH}/include" "@dlib_needed_includes@")
  
 # Our library dependencies (contains definitions for IMPORTED targets)
 if(NOT TARGET dlib-shared AND NOT dlib_BINARY_DIR)
+   # Compute paths
+   get_filename_component(dlib_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
    include("${dlib_CMAKE_DIR}/dlib.cmake")
 endif()
 
-find_library(dlib_LIBRARIES dlib HINTS ${dlib_INSTALL_PATH}/lib)
+find_library(dlib_LIBRARIES dlib HINTS "@CMAKE_INSTALL_FULL_LIBDIR@")
 set(dlib_LIBRARIES ${dlib_LIBRARIES} "@dlib_needed_libraries@")
 set(dlib_LIBS      ${dlib_LIBRARIES} "@dlib_needed_libraries@")
+set(dlib_INCLUDE_DIRS "@CMAKE_INSTALL_FULL_INCLUDEDIR@" "@dlib_needed_includes@")
 
-include(${dlib_INSTALL_PATH}/include/dlib/cmake_utils/use_cpp_11.cmake)
+include(@CMAKE_INSTALL_FULL_INCLUDEDIR@/dlib/cmake_utils/use_cpp_11.cmake)