Fix compile issues.

src/base/net/stratum/Pools.cpp

@@ -164,7 +164,7 @@ void xmrig::Pools::print() const
             Log::i()->text(GREEN_BOLD(" * ") WHITE_BOLD("POOL #%-7zu") "\x1B[1;%dm%s\x1B[0m variant " WHITE_BOLD("%s"),
                            i,
                            color,
-                           pool.url(),
+                           pool.url().data(),
                            pool.algorithm().variantName()
                            );
         }
@@ -172,7 +172,7 @@ void xmrig::Pools::print() const
             Log::i()->text(" * POOL #%-7zu%s%s variant=%s %s",
                            i,
                            pool.isEnabled() ? "" : "-",
-                           pool.url(),
+                           pool.url().data(),
                            pool.algorithm().variantName(),
                            pool.isTLS() ? "TLS" : ""
                            );