Merge pull request #581 from Jehan/wip/Jehan/no-strict-prototypes-windows

CMakeLists: do not enforce strict prototypes on Windows.

CMakeLists.txt

@@ -240,7 +240,9 @@ if ("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wextra")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wwrite-strings")
     set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wno-unused-parameter")
-    set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wstrict-prototypes")
+    if (NOT WIN32)
+        set(CMAKE_C_FLAGS           "${CMAKE_C_FLAGS} -Wstrict-prototypes")
+    endif()
 
     add_definitions(-D_GNU_SOURCE)
 elseif ("${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC")