qt: enable -ltcg for windows HOST

Patch around multiple definition issues in Qt.

Co-authored-by: Cory Fields <cory-nospam-@coryfields.com>

depends/patches/qt/windows_lto.patch

@@ -0,0 +1,31 @@
+Qt (for Windows) fails to build under LTO, due to multiple definition issues, i.e
+
+multiple definition of `QAccessibleLineEdit::~QAccessibleLineEdit()';
+
+Possibly related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94156.
+
+diff --git a/qtbase/src/widgets/accessible/simplewidgets.cpp b/qtbase/src/widgets/accessible/simplewidgets.cpp
+index 107fd729fe..0e61878f39 100644
+--- a/qtbase/src/widgets/accessible/simplewidgets.cpp
++++ b/qtbase/src/widgets/accessible/simplewidgets.cpp
+@@ -109,6 +109,8 @@ QString qt_accHotKey(const QString &text);
+   \ingroup accessibility
+ */
+ 
++QAccessibleLineEdit::~QAccessibleLineEdit(){};
++
+ /*!
+   Creates a QAccessibleButton object for \a w.
+ */
+diff --git a/qtbase/src/widgets/accessible/simplewidgets_p.h b/qtbase/src/widgets/accessible/simplewidgets_p.h
+index 73572e3059..658da86143 100644
+--- a/qtbase/src/widgets/accessible/simplewidgets_p.h
++++ b/qtbase/src/widgets/accessible/simplewidgets_p.h
+@@ -155,6 +155,7 @@ class QAccessibleLineEdit : public QAccessibleWidget, public QAccessibleTextInte
+ public:
+     explicit QAccessibleLineEdit(QWidget *o, const QString &name = QString());
+ 
++    ~QAccessibleLineEdit();
+     QString text(QAccessible::Text t) const override;
+     void setText(QAccessible::Text t, const QString &text) override;
+     QAccessible::State state() const override;