disable warnings for zib.

contrib/zlib/CMakeLists.txt

@@ -72,6 +72,7 @@ endif()
 check_include_file(unistd.h Z_HAVE_UNISTD_H)
 
 if(MSVC)
+    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /wd4131 /wd4127 /wd4244")
     set(CMAKE_DEBUG_POSTFIX "d")
     add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
     add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)