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.

wgl: Correctly check GLX capabilities. Use client GLX extensions on ATI hardware to work around driver bugs.

For now we forward the methods to the data cache as before.