Failing mshtml:xmlhttprequest test

[Francois Gouget]

Since the WineHQ.org upgrade the mshtml:xmlhttprequest test has been 
failing on all platforms:

xmlhttprequest.c:448: Test failed: Expect Server: Apache, got L"Apache/2.4.10 (Debian)"

Due to:

583     static const struct HEADER_TYPE expect_headers[] = {
 584         {"Server", "Apache"},
 585         {"Accept-Ranges", "bytes"},

Fixing the failure is easy, but maybe the test should be more flexible? 
It could be annoying to have to upgrade it with each minor server 
upgrade.