Fix build error on Windows without precompiled headers

Recent refactoring to use uint relied on indirect includes and precompiled
headers for uint to be defined. Explicitly include BLI_sys_types where this
type is used now.

source/blender/freestyle/intern/python/Interface0D/BPy_SVertex.cpp

@@ -10,6 +10,8 @@
 #include "../BPy_Id.h"
 #include "../Interface1D/BPy_FEdge.h"
 
+#include "BLI_sys_types.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif