File gcc7-fix.patch of Package telegram-desktop

Index: tdesktop-1.5.15/Telegram/SourceFiles/boxes/add_contact_box.cpp
===================================================================
--- tdesktop-1.5.15.orig/Telegram/SourceFiles/boxes/add_contact_box.cpp
+++ tdesktop-1.5.15/Telegram/SourceFiles/boxes/add_contact_box.cpp
@@ -97,7 +97,7 @@ void ShowAddParticipantsError(
 					channel,
 					user,
 					close,
-					close);
+					[=] { close(0); });
 				auto box = Box<EditAdminBox>(
 					channel,
 					user,
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