tests/ecc: guard EccDecisionCoverage3 against FIPS/selftest builds

test_wc_EccDecisionCoverage3 calls wc_ecc_import_unsigned and
wc_ecc_rs_raw_to_sig, which are not available in the frozen
CAVP-selftest wolfCrypt module (their declarations are gated off by the
minimal selftest feature config), so the CAVP-selftest CI leg fails to
compile them under -Werror. Exclude the function from HAVE_SELFTEST /
HAVE_FIPS builds, matching the sibling EccDecisionCoverage functions.
This class is only visible via an actual --enable-selftest compile, not
a header symbol diff.

Author: danielinux

tests/api/test_ecc.c

@@ -2506,7 +2506,8 @@ int test_wc_EccDecisionCoverage3(void)
     EXPECT_DECLS;
 #if defined(HAVE_ECC) && !defined(WC_NO_RNG) && \
     !defined(WOLF_CRYPTO_CB_ONLY_ECC) && !defined(WOLFSSL_ATECC508A) && \
-    !defined(WOLFSSL_ATECC608A) && !defined(WOLFSSL_MICROCHIP_TA100)
+    !defined(WOLFSSL_ATECC608A) && !defined(WOLFSSL_MICROCHIP_TA100) && \
+    !defined(HAVE_SELFTEST) && !defined(HAVE_FIPS)
     WC_RNG  rng;
     ecc_key key;
     int     ret;