crypt32: Add stub for CertVerifyCTLUsage.

[Robert Shearman]

---
  dlls/crypt32/cert.c       |   12 ++++++++++++
  dlls/crypt32/crypt32.spec |    2 +-
  2 files changed, 13 insertions(+), 1 deletions(-)

Outlook 2003 uses this function via wintrust.
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