Fix compilation error after recent luma changes on certain platforms

See T47243 for some more details.

source/blender/imbuf/intern/openexr/openexr_api.cpp

@@ -71,9 +71,6 @@ _CRTIMP void __cdecl _invalid_parameter_noinfo(void)
 #include "IMB_allocimbuf.h"
 #include "IMB_metadata.h"
 
-#include "IMB_colormanagement.h"
-#include "IMB_colormanagement_intern.h"
-
 #include "openexr_multi.h"
 }
 
@@ -104,6 +101,11 @@ _CRTIMP void __cdecl _invalid_parameter_noinfo(void)
 #include <ImfPartType.h>
 #include <ImfPartHelper.h>
 
+extern "C" {
+#include "IMB_colormanagement.h"
+#include "IMB_colormanagement_intern.h"
+}
+
 using namespace Imf;
 using namespace Imath;