multiprecision: ignore buggy -Waggressive-loop-optimizations in subtraction

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[github-actions]

Clang Test Results

  174 files  ±0    174 suites  ±0   16m 45s ⏱️ + 1m 3s
8 545 tests +4  8 539 ✅ +4  6 💤 ±0  0 ❌ ±0 
8 611 runs  +4  8 605 ✅ +4  6 💤 ±0  0 ❌ ±0 

Results for commit 1cd2d77. ± Comparison against base commit 0ec44ed.

[github-actions]

Gcc Test Results

  174 files  ± 0    174 suites  ±0   15m 5s ⏱️ +5s
8 448 tests  - 93  8 442 ✅  - 93  6 💤 ±0  0 ❌ ±0 
8 514 runs   - 93  8 508 ✅  - 93  6 💤 ±0  0 ❌ ±0 

Results for commit 1cd2d77. ± Comparison against base commit 0ec44ed.

This pull request removes 99 and adds 6 tests. Note that renamed tests count towards both.

pack_equal_test_suite ‑ bubb_to_bubb_1
pack_equal_test_suite ‑ bubb_to_bubb_2
pack_equal_test_suite ‑ bubb_to_bubb_3
pack_equal_test_suite ‑ bubb_to_bulb_1
pack_equal_test_suite ‑ bubb_to_bulb_2
pack_equal_test_suite ‑ bubb_to_lubb_1
pack_equal_test_suite ‑ bubb_to_lubb_2
pack_equal_test_suite ‑ bubb_to_lubb_3
pack_equal_test_suite ‑ bubb_to_lulb_1
pack_equal_test_suite ‑ bubb_to_lulb_2
…

pack_imploder_test_suite ‑ be_to_be_1
pack_imploder_test_suite ‑ be_to_be_2
pack_imploder_test_suite ‑ be_to_le_1
pack_imploder_test_suite ‑ be_to_le_2
pack_imploder_test_suite ‑ be_to_le_3
pack_imploder_test_suite ‑ bubb_to_lulb_4