include: Add some flags related to BCryptGenRandom in bcrypt.h

[Bruno Jesus]

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diff --git a/include/bcrypt.h b/include/bcrypt.h
index 43d1f94..601f839 100644
--- a/include/bcrypt.h
+++ b/include/bcrypt.h
@@ -47,4 +47,8 @@ typedef struct _BCRYPT_ALGORITHM_IDENTIFIER
     ULONG  dwFlags;
 } BCRYPT_ALGORITHM_IDENTIFIER;
 
+/* Flags for BCryptGenRandom */
+#define BCRYPT_RNG_USE_ENTROPY_IN_BUFFER 0x00000001
+#define BCRYPT_USE_SYSTEM_PREFERRED_RNG  0x00000002
+
 #endif  /* __WINE_BCRYPT_H */