oleaut: Make TLB_ReadTypeLib not rely on the signature of executables or dlls

[Robert Shearman]

ChangeLog:
Make TLB_ReadTypeLib not rely on the signature of executables or dlls.
Try loading the dll first and then fall back to the regular file case.
Only call SearchPath for the regular file case since LoadLibraryEx will
do this for us and it previously excluded builtin dlls and executables
from having their type libraries opened.

  dlls/oleaut32/typelib.c |  146 
++++++++++++++++++++++-------------------------
  1 files changed, 69 insertions(+), 77 deletions(-)

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