[cmake] added local PATH, LD_LIBRARY_PATH and PKG_CONFIG_PATH for qtcreator

I think it wont hurt in other usecases

CMakeLists.txt

@@ -4,6 +4,11 @@ PROJECT(dune-stuff)
 cmake_minimum_required(VERSION 2.6)
 
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake )
+
+SET(ENV{PATH} "${CMAKE_CURRENT_SOURCE_DIR}/../local/bin:$ENV{PATH}" )
+SET(ENV{LD_LIBRARY_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/../local/lib:$ENV{LD_LIBRARY_PATH}" )
+SET(ENV{PKG_CONFIG_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/../local/lib/pkgconfig:$ENV{PKG_CONFIG_PATH}" )
+
 include(DuneUtils)
 include(UseDoxygen)