Fix divide by zero in time_manager

[rickgrubin-noaa]

Description

Add flags -fp-model=precise -fp-speculation=safe for Intel OneAPI Fortran ifx

Fixes #1891

No dependencies required for this change.

How Has This Been Tested?

Testing:

• modifying the spack-packages recipe for FMS to inject flags -fp-model=precise -fp-speculation=safe into the package build. Subsequent UFS WM regression tests succeed / do not generate divide-by-zero errors.
• re-created Dusan Jovic's reproducer test, and build / ran it against the updated spack-stack build noted above. See: /gpfs/f6/epic/scratch/Richard.Grubin/test_time_manager
  • compare with: /gpfs/f6/drsa-hurr1/scratch/Dusan.Jovic/ufs/ss210/test_time_manager
  • for both reproducer tests: run build.sh
• cloned my repository fork for the bugfix branch
  • configured and executed a cmake build
  • ran tests for time_manager
    • see attached file test.time_manager.log

Host / compiler info:

• Host: gaea-c6
• OS

% cat /etc/os-release
NAME="SLES"
VERSION="15-SP6"
VERSION_ID="15.6"
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP6"
ID="sles"

• Compiler: Intel oneAPI@2025.2.1

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes