Roland Schulz authored Apr 12, 2018 and Brad King committed Apr 16, 2018

The change in commit v3.11.0-rc1~334^2 (FindOpenMP: Use NO_DEFAULT_PATH
where appropriate, 2017-11-15) broke partial support for Intel on Windows.
Since `OpenMP_${LANG}_IMPLICIT_LINK_DIRS` is empty for this compiler
the `find_library` call without `NO_DEFAULT_PATH` worked accidentally
in environments with the needed libraries in the search path already.

Fix support for Intel on Windows by simply removing our explicit search
for the `libiomp5md` library.  In cases that it is needed, the compiler
already inserts metadata in `.obj` files to tell the MSVC linker to use
the library.

Suggested-by: Christian Pfeiffer <cpfeiffer@live.de>
Fixes: #17910