They're not stable across table resizes.

This is consistent with BindTexture in basetexture/texture/etc. and has the
added benefit that it makes LoadLocation work properly.

crypt32: Allow messages to be opened when compiled with CMSG_SIGNED_ENCODE_INFO_HAS_CMS_FIELDS if CMS fields aren't actually used.

crypt32: Allow messages to be opened when compiled with CMSG_SIGNER_ENCODE_INFO_HAS_CMS_FIELDS if CMS fields aren't actually used.

winhttp: Add stub implementations for WinHttpGetDefaultProxyConfiguration, WinHttpGetProxyForUrl and WinHttpSetDefaultProxyConfiguration.