code cleanup: cycles now uses system includes for boost/oiio.. etc, so we dont get warnings from system headers.

intern/cycles/kernel/osl/CMakeLists.txt

@@ -7,6 +7,8 @@ set(INC
 	../../util
 	../../device
 )
+set(INC_SYS
+)
 
 set(SRC
 	background.cpp
@@ -39,6 +41,7 @@ set(HEADER_SRC
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${RTTI_DISABLE_FLAGS}")
 
 include_directories(${INC})
+include_directories(SYSTEM ${INC_SYS})
 
 add_library(cycles_kernel_osl ${SRC} ${HEADER_SRC})