try configure cross for musl targets

[nhtyy]

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[github-actions]

Test	Old	New	Diff
secp256k1_program_test_recover_v0_30_0_rand_lte_100	6637065	6640332	0.0492 %
sha_test_sha2_v0_10_6_expected_digest_lte_100_times	1734401	1730812	-0.2069 %
curve25519_dalek_test_zero_mul	197103	197103	0.0000 %
rustcrypto_bigint_test_bigint_mul_mod_special	2315020	2315020	0.0000 %
curve25519_dalek_test_ed25519_verify	32351423	32349980	-0.0045 %
k256_test_schnorr_verify	7036338	7042545	0.0882 %
sha_test_sha2_v0_10_8_expected_digest_lte_100_times	1730471	1734444	0.2296 %
bn_test_bn_test_fr_inverse_100	796856	796856	0.0000 %
secp256k1_program_test_verify_rand_lte_100	46861729	46856596	-0.0110 %
sha_test_sha2_v0_9_9_expected_digest_lte_100_times	1489678	1487416	-0.1518 %
curve25519_dalek_ng_test_add_then_multiply	6137462	5940893	-3.2028 %
keccack_test_expected_digest_lte_100	2035689	2036956	0.0622 %
curve25519_dalek_ng_test_zero_msm	216592	216592	0.0000 %
k256_test_recover_rand_lte_100	5615340	5608355	-0.1244 %
curve25519_dalek_test_decompressed_expected_value	15843992	15231050	-3.8686 %
rustcrypto_bigint_test_bigint_mul_add_residue	2253569	2253569	0.0000 %
bls12_381_tests_test_sqrt_fp2_100	1986103	1959256	-1.3517 %
bls12_381_tests_test_inverse_fp2_100	3083020	3083020	0.0000 %
k256_test_verify_rand_lte_100	24834746	24839467	0.0190 %
rust_crypto_rsa_test_pkcs_verify_100	101984170	101897905	-0.0846 %
bls12_381_tests_test_inverse_fp_100	1375050	1375050	0.0000 %
bn_test_bn_test_fq_sqrt_100	763356	763356	0.0000 %
k256_test_recover_high_hash_high_recid	2896778	2756787	-4.8326 %
curve25519_dalek_ng_test_zero_mul	197063	197063	0.0000 %
secp256k1_program_test_verify_v0_30_0_rand_lte_100	46783436	46731320	-0.1114 %
curve25519_dalek_test_add_then_multiply	6580052	5736174	-12.8248 %
p256_test_recover_rand_lte_100	7268685	7258471	-0.1405 %
bn_test_bn_test_g1_add_100	846345	846331	-0.0017 %
curve25519_dalek_ng_test_decompressed_noncanonical	206954	206954	0.0000 %
secp256k1_program_test_recover_rand_lte_100	6594897	6611230	0.2477 %
p256_test_recover_pubkey_infinity	143003	143003	0.0000 %
sha_test_sha3_expected_digest_lte_100_times	1668751	1668678	-0.0044 %
bls12_381_tests_test_sqrt_fp_100	970718	1096968	13.0058 %
curve25519_dalek_test_zero_msm	213024	213024	0.0000 %
p256_test_recover_high_hash_high_recid	3449905	3804141	10.2680 %
k256_test_recover_pubkey_infinity	124534	124534	0.0000 %
bn_test_bn_test_g1_double_100	648027	648027	0.0000 %
bls12_381_tests_test_bls_double_100	9218745	9218745	0.0000 %
bls12_381_tests_test_bls_add_100	15763438	15763438	0.0000 %
bn_test_bn_test_fq_inverse_100	766356	766356	0.0000 %
p256_test_verify_rand_lte_100	24839637	24862855	0.0935 %
curve25519_dalek_test_decompressed_noncanonical	9169	9169	0.0000 %