Fix OpenSSL option in Dockerfile

Dockerfile

@@ -22,7 +22,7 @@ ARG RESTY_PCRE_SHA256="4e6ce03e0336e8b4a3d6c2b70b1c5e18590a5673a98186da90d4f33c2
 ARG RESTY_J="2"
 ARG RESTY_CONFIG_OPTIONS="\
     --with-openssl=Tongsuo-8.4.0 \
-    --with-openssl-opt='--strict-warnings enable-ntls' \
+    --with-openssl-opt='enable-ntls' \
     --with-compat \
     --with-file-aio \
     --with-http_addition_module \