[CMake] Suppress hdf5 compiler wrapper checks on Conan and !MSVC.

Suppresses (misleading) errors such as:

-- HDF5 C compiler wrapper is unable to compile a minimal HDF5 program.

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If hdf5 is successfully found it just prints (on the first CMake-run):

-- Found HDF5: ~/.conan/data/hdf5/1.12.0/_/_/package/a24156477f4f00ae83ffd3548539d546ffc1c599/lib/libhdf5.a (found version "1.12.0") 

cc: @nagelt

changed milestone to %6.3.3

added workflowplease review label

approved this merge request

merged

mentioned in commit 3c2fcdcb

removed workflowplease review label