Tweak optimization for faster Intel Release build

[mathomp4]

Description

Trying to speed the build of MAPL by lowering optimization levels of expensive files.

The profile before:

and the build was ~10 minutes.

After:

and the build is ~4 minutes. Nice!

Related Issue

Motivation and Context

Faster builds lead to faster development! Plus it makes the GEOSgcm Release build about 2-3 minutes faster.

How Has This Been Tested?

Runs with GEOSgcm show it to be zero-diff.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)

Checklist:

• I have tested this change with a run of GEOSgcm (if non-trivial)
• I have added one of the required labels (0 diff, 0 diff trivial, 0 diff structural, non 0-diff)
• I have updated the CHANGELOG.md accordingly following the style of Keep a Changelog

[mathomp4]

Note: I tried a few things with the GNU build but nothing seemed to matter there.