Define SMTC_MODULE for liblegacy.a to avoid multiple definition #1420

Job	Run time
basic_clang	4m 13s
basic_gcc	4m 25s
check_update	57s
check-ansi	1m 54s
minimal	2m 27s
no-deprecated	3m 59s
non-caching	4m 18s
no-shared (ubuntu-latest)	3m 15s
address_ub_sanitizer	11m 19s
no-shared (macos-latest)	2m 58s
enable_non-default_options	3m 44s
fips_and_ktls	4m 20s
legacy	3m 43s
memory_sanitizer	26m 4s
no-legacy	4m 25s
ntls_address_ub_sanitizer	9m 50s
ntls_memory_sanitizer	18m 10s
phe_test	36m 14s
symbol_prefix-test	7m 6s
threads_sanitizer	3m 42s
buildtest	7m 0s
EC_POINTs_api_test	19m 6s
ntls-with-fips	8m 0s
external-test-pyca (1.51.0, 3.9)	1m 29s
ntls-without-sm234	6m 54s
out-of-source-and-install (ubuntu-latest)	4m 35s
sm2-threshold-test	43m 44s
out-of-source-and-install (macos-latest)	3m 17s
smtc_and_ntls	2m 12s
zkp-build-test	3m 19s
	4h 16m 39s

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