depends: drop unused qt patch

This hasn't been applied since 5e794e6202,
but the patch was never removed.

depends/patches/qt/memory_resource.patch

@@ -1,16 +0,0 @@
-Fix unusable memory_resource on macos
-
-See https://bugreports.qt.io/browse/QTBUG-117484
-and https://bugreports.qt.io/browse/QTBUG-114316
-
---- a/qtbase/src/corelib/tools/qduplicatetracker_p.h
-+++ b/qtbase/src/corelib/tools/qduplicatetracker_p.h
-@@ -52,7 +52,7 @@
- 
- #include <qglobal.h>
- 
--#if QT_HAS_INCLUDE(<memory_resource>) && __cplusplus > 201402L
-+#ifdef __cpp_lib_memory_resource
- #  include <unordered_set>
- #  include <memory_resource>
- #else