Fix typo (Fixes winsiderss#325)

Author: dmex

phlib/include/symprvp.h

@@ -105,7 +105,7 @@ typedef ULONG64 (WINAPI *_SymGetModuleBase64)(
 typedef BOOL (WINAPI *_SymRegisterCallbackW64)(
     _In_ HANDLE ProcessHandle,
     _In_ PSYMBOL_REGISTERED_CALLBACK64 CallbackFunction,
-    _In_ PVOID UserContext
+    _In_ ULONG64 UserContext
     );
 
 typedef BOOL (WINAPI *_StackWalk64)(

phlib/symprv.c

@@ -356,7 +356,7 @@ VOID PhpRegisterSymbolProvider(
             SymInitializeW_I(SymbolProvider->ProcessHandle, NULL, FALSE);
 
             if (SymRegisterCallbackW64_I)
-                SymRegisterCallbackW64_I(SymbolProvider->ProcessHandle, PhpSymbolCallbackFunction, SymbolProvider);
+                SymRegisterCallbackW64_I(SymbolProvider->ProcessHandle, PhpSymbolCallbackFunction, (ULONG64)SymbolProvider);
 
             PH_UNLOCK_SYMBOLS();