Remove use of _Static_assert #882

Job	Run time
address_ub_sanitizer	14m 33s
basic_clang	7m 9s
basic_gcc	9m 21s
buildtest	9m 49s
check_docs	1m 13s
check_update	1m 41s
check-ansi	5m 9s
enable_brotli_and_asan_ubsan	13m 24s
enable_brotli_and_zstd_dynamic	7m 20s
enable_brotli_dynamic	7m 25s
enable_non-default_options	6m 31s
enable_zstd_and_asan_ubsan	14m 21s
enable_zstd_dynamic	9m 24s
enable-tfo (ubuntu-latest)	8m 30s
enable-tfo (macos-latest)	10m 36s
external-test-cf-quiche	8m 33s
external-test-pyca (1.51.0, 3.9)	10m 44s
external-tests	14m 0s
fips_and_ktls	9m 50s
legacy	5m 52s
memory_sanitizer	23m 15s
minimal	3m 23s
no-deprecated	7m 11s
no-legacy	8m 59s
non-caching	23m 57s
no-shared (ubuntu-latest)	7m 58s
no-shared (macos-latest)	8m 46s
out-of-source-and-install (ubuntu-latest)	9m 56s
out-of-source-and-install (macos-latest)	16m 50s
threads_sanitizer	7m 36s
	4h 53m 16s

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