lib/fmt/RuntimeError: new library

Replacing FormatRuntimeError().

src/storage/plugins/CurlStorage.cxx

@@ -30,12 +30,12 @@
 #include "lib/curl/Handler.hxx"
 #include "lib/curl/Escape.hxx"
 #include "lib/expat/ExpatParser.hxx"
+#include "lib/fmt/RuntimeError.hxx"
 #include "fs/Traits.hxx"
 #include "event/InjectEvent.hxx"
 #include "thread/Mutex.hxx"
 #include "thread/Cond.hxx"
 #include "util/ASCII.hxx"
-#include "util/RuntimeError.hxx"
 #include "util/SpanCast.hxx"
 #include "util/StringCompare.hxx"
 #include "util/StringFormat.hxx"
@@ -302,8 +302,8 @@ private:
 	/* virtual methods from CurlResponseHandler */
 	void OnHeaders(unsigned status, Curl::Headers &&headers) final {
 		if (status != 207)
-			throw FormatRuntimeError("Status %d from WebDAV server; expected \"207 Multi-Status\"",
-						 status);
+			throw FmtRuntimeError("Status {} from WebDAV server; expected \"207 Multi-Status\"",
+					      status);
 
 		if (!IsXmlContentType(headers))
 			throw std::runtime_error("Unexpected Content-Type from WebDAV server");

src/storage/plugins/UdisksStorage.cxx

@@ -23,6 +23,7 @@
 #include "storage/StorageInterface.hxx"
 #include "storage/FileInfo.hxx"
 #include "lib/fmt/ExceptionFormatter.hxx"
+#include "lib/fmt/RuntimeError.hxx"
 #include "lib/dbus/Glue.hxx"
 #include "lib/dbus/AsyncRequest.hxx"
 #include "lib/dbus/Message.hxx"
@@ -38,7 +39,6 @@
 #include "fs/AllocatedPath.hxx"
 #include "util/Domain.hxx"
 #include "util/StringCompare.hxx"
-#include "util/RuntimeError.hxx"
 #include "Log.hxx"
 
 #include <stdexcept>
@@ -180,8 +180,8 @@ UdisksStorage::OnListReply(ODBus::Message reply) noexcept
 		});
 
 		if (dbus_path.empty())
-			throw FormatRuntimeError("No such UDisks2 object: %s",
-						 id.c_str());
+			throw FmtRuntimeError("No such UDisks2 object: {}",
+					      id);
 
 		if (!mount_point.empty()) {
 			/* already mounted: don't attempt to mount