Include std flags in CXX compiler for pkgconfig.

[[Imported from SVN: r6741]]

cmake/modules/FindCXX11Features.cmake

@@ -12,6 +12,7 @@ if(CXX_FLAG_CXX11)
   set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -std=c++11 ")
   set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -std=c++11 ")
   set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -std=c++11 ")
+  set(CXX_STD0X_FLAGS "-std=c++11")
 else()
   CHECK_CXX_ACCEPTS_FLAG("-std=c++0x" CXX_FLAG_CXX0X)
   if(CXX_FLAG_CXX0X)
@@ -21,6 +22,7 @@ else()
     set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -std=c++0x ")
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -std=c++0x ")
     set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -std=c++0x ")
+  set(CXX_STD0X_FLAGS "-std=c++0x")
   endif(CXX_FLAG_CXX0X)
 endif(CXX_FLAG_CXX11)