NOISSUE fix macOS build, remove bundled dependencies on linux

Your copy of MultiMC might stop working after this update
because we no longer bundle Qt and other system libraries.

Contact us at https://discord.gg/0k2zsXGNHs0fE4Wm if
you need help with installing Qt.

Qt 5.4.x or newer is required.

api/logic/icons/IconUtils.cpp

@@ -6,14 +6,14 @@
 #include <array>
 
 namespace {
-std::array<const char *, 6> validIconExtensions = {
+std::array<const char *, 6> validIconExtensions = {{
     "svg",
     "png",
     "ico",
     "gif",
     "jpg",
     "jpeg"
-};
+}};
 }
 
 namespace IconUtils{