include: Fix prototype of CryptUIWizDigitalSign.

include/cryptuiapi.h

@@ -240,6 +240,7 @@ typedef struct _CRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT
     DWORD cbBlob;
     BYTE *pbBlob;
 } CRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT, *PCRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT;
+typedef const CRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT *PCCRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT;
 
 /* Values for CryptUIWizDigitalSign's dwFlags */
 #define CRYPTUI_WIZ_NO_UI                            0x00000001
@@ -248,7 +249,7 @@ typedef struct _CRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT
 
 BOOL WINAPI CryptUIWizDigitalSign(DWORD dwFlags, HWND hwndParent,
  LPCWSTR pwszWizardTitle, PCCRYPTUI_WIZ_DIGITAL_SIGN_INFO pDigitalSignInfo,
- PCRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT *ppSignContext);
+ PCCRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT *ppSignContext);
 
 BOOL WINAPI CryptUIWizFreeDigitalSignContext(
  PCRYPTUI_WIZ_DIGITAL_SIGN_CONTEXT pSignContext);