Remove redundant RSA dependency

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 375073d..f21cfc9 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -2732,7 +2732,6 @@
 
 # Tests for SHA-1 support
 requires_hash_alg SHA_1
-requires_config_enabled MBEDTLS_RSA_C
 run_test    "SHA-1 forbidden by default in server certificate" \
             "$P_SRV key_file=data_files/server2.key crt_file=data_files/server2.crt" \
             "$P_CLI debug_level=2 force_version=tls12 allow_sha1=0" \