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 5fb954d..1d4f428 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -1963,7 +1963,6 @@
 # Tests for SHA-1 support
 
 requires_config_enabled MBEDTLS_SHA1_C
-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 allow_sha1=0" \