Update HDF5UseFortran.cmake

[eschnett]

Remove extraneous curly braces from log output

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Important

Remove extraneous curly braces from log message in HDF5UseFortran.cmake.

• Logging:
  • Remove extraneous curly braces from log message in HDF5UseFortran.cmake for PAC_FC_ALL_REAL_KINDS_SIZEOF.

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