Remove dependency on SVM class.

This dependency caused:

java.lang.ClassNotFoundException:
com.oracle.svm.core.jdk.UnsupportedFeatureError

when using the RestClient in HotSpot mode

extensions/rest-client/runtime/src/main/java/org/jboss/shamrock/restclient/runtime/RestClientBase.java

@@ -16,14 +16,12 @@
 
 package org.jboss.shamrock.restclient.runtime;
 
-import java.net.MalformedURLException;
-import java.net.URL;
-
 import org.eclipse.microprofile.config.Config;
 import org.eclipse.microprofile.config.ConfigProvider;
 import org.eclipse.microprofile.rest.client.RestClientBuilder;
 
-import com.oracle.svm.core.jdk.UnsupportedFeatureError;
+import java.net.MalformedURLException;
+import java.net.URL;
 
 public class RestClientBase {
 
@@ -45,8 +43,11 @@ public Object create() {
             return builder.baseUrl(new URL(baseUrl)).build(proxyType);
         } catch (MalformedURLException e) {
             throw new IllegalArgumentException("The value of URL was invalid " + baseUrl);
-        } catch (UnsupportedFeatureError e) {
-            throw new IllegalArgumentException(baseUrl + " requires SSL support but it is disabled. You probably have set shamrock.ssl.native to false.");
+        } catch (Exception e) {
+            if ("com.oracle.svm.core.jdk.UnsupportedFeatureError".equals(e.getClass().getCanonicalName())) {
+                throw new IllegalArgumentException(baseUrl + " requires SSL support but it is disabled. You probably have set shamrock.ssl.native to false.");
+            }
+            throw e;
         }
     }