msi: Write-strings warnings fix

[Andrew Talbot]

Mike McCormack wrote:
> Which version of the Windows SDK is that?
> 
>> -UINT WINAPI MsiGetFeatureStateA(MSIHANDLE hInstall, LPSTR szFeature,
>> +UINT WINAPI MsiGetFeatureStateA(MSIHANDLE hInstall, LPCSTR szFeature,
>>                    INSTALLSTATE *piInstalled, INSTALLSTATE *piAction)
> 
> According to my version of the Windows SDK, these changes are wrong.

I look the functions up on http://windowssdk.msdn.microsoft.com/.
Specifically, I used the data at
http://windowssdk.msdn.microsoft.com/en-us/library/ms702868.aspx for these
database functions.

-- Andy.