client/Response: remove unused method Format()

src/client/Response.cxx

@@ -49,16 +49,6 @@ Response::FormatV(const char *fmt, std::va_list args) noexcept
 }
 
 bool
-Response::Format(const char *fmt, ...) noexcept
-{
-	std::va_list args;
-	va_start(args, fmt);
-	bool success = FormatV(fmt, args);
-	va_end(args);
-	return success;
-}
-
-bool
 Response::VFmt(fmt::string_view format_str, fmt::format_args args) noexcept
 {
 	fmt::memory_buffer buffer;

src/client/Response.hxx

@@ -81,9 +81,6 @@ public:
 	bool Write(const char *data) noexcept;
 	bool FormatV(const char *fmt, std::va_list args) noexcept;
 
-	gcc_printf(2,3)
-	bool Format(const char *fmt, ...) noexcept;
-
 	bool VFmt(fmt::string_view format_str, fmt::format_args args) noexcept;
 
 	template<typename S, typename... Args>