Implement CertGetEnhancedKeyUsage, CertSetEnhancedKeyUsage,
CertAddEnhancedKeyUsageIdentifier, and
CertRemoveEnhancedKeyUsageIdentifier.

x86_64 in 32-bit mode.

Setting the EOF flag only if _read() returns zero is not enough as we
could also read something AND hit the end of file.
_read() already sets another internal EOF flag, so just use this too.
Removing todo_wine from the test case.

When calling fread() with a large enough buffer to reach the end of
the file a subsequent feof() should return true; (marked as todo_wine
because it doesn't work atm).

We can't just pop a exception record from the exception handler list
which we haven't put there.

Added dependency on $(RELPATH).

number of directories.

WINELOADER/WINESERVER environment variables in wine_exec_wine_binary.

the directory from the library itself.
Only try the hardcoded BINDIR if everything else failed.

Add support for encoding/decoding basic constraints and enhanced key
usage, with tests.

- now that CertOpenStore is correct for system stores, simplify
  CertOpenSystemStore
- correct CertDuplicateCertificateStore, with a test