Remove BORINGSSL_FIPS_BREAK_FFC_DH

[andrewhop]

Description of changes:

While working on the clang-format change I noticed it doesn't handle this well and converts it into a long list with a single element per line: /~https://github.com/andrewhop/aws-lc/blob/clang_format/crypto/fipsmodule/self_check/self_check.c#L722-L982. AWS-LC does not use this build flag for testing, instead we rely on break-kat.go to test and demonstrate the CAST can be broken: /~https://github.com/aws/aws-lc/blob/main/util/fipstools/break-kat.go#L38.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.04%. Comparing base (493207c) to head (e4a7f9b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2216      +/-   ##
==========================================
- Coverage   79.06%   79.04%   -0.02%     
==========================================
  Files         612      612              
  Lines      106327   106327              
  Branches    15023    15023              
==========================================
- Hits        84064    84048      -16     
- Misses      21611    21627      +16     
  Partials      652      652              

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