propagate Lua include dir when compile-checking Luabind, fixes #1196

cmake/check_luabind.cmake

@@ -11,10 +11,12 @@ if(NOT APPLE)
   find_package(LuaJIT 5.2)
 endif()
 if(LUA52_FOUND)
+  set (CMAKE_REQUIRED_INCLUDES "${Boost_INCLUDE_DIR};${LUABIND_INCLUDE_DIR};${LUA_INCLUDE_DIR}")
+  set (CMAKE_REQUIRED_LIBRARIES "${LUABIND_LIBRARY};${LUA_LIBRARY}")
   CHECK_CXX_SOURCE_COMPILES("${LUABIND_CHECK_SRC}" LUABIND_WORKS)
 endif()
 
-if( LUABIND_WORKS )
+if(LUABIND_WORKS)
   message(STATUS "Luabind/Lua5.2 combination working with ${LUA_LIBRARY}")
 else()
   message(STATUS "Luabind/Lua5.2 not feasible, falling back to Lua 5.1.")
@@ -30,7 +32,7 @@ else()
 
   CHECK_CXX_SOURCE_COMPILES("${LUABIND_CHECK_SRC}" LUABIND51_WORKS)
 
-  if( LUABIND51_WORKS )
+  if(LUABIND51_WORKS)
     message(STATUS "Luabind works with Lua 5.1 at ${LUA_LIBRARY}")
   else()
     message(FATAL_ERROR	"Luabind does not work with Lua 5.1 at ${LUA_LIBRARY}, no working Luabind found")