d3d8/tests: DXGetErrorString8() prints 'Unknown' for too many hresults which makes diagnosis impossible. So print the raw code instead.

msi: Better match the PSDK types, remove some now unused types from win32.api, and update it to fix the winapi_check warnings.

wininet: Add a skeleton winineti.h header with fixed prototypes for [GS]etUrlCacheConfigInfo*(), DeleteIE3Cache() and IsUrlCacheEntryExpired*().

Remove SetUrlCacheConfigInfo*() from wininet.h, it's supposed to be declared in winineti.h.
Update win32.api to fix the winapi_check warnings.