build, qt: Fix static builds on macOS Big Sur

See details and the patch: https://bugreports.qt.io/browse/QTBUG-87014

depends/packages/qt.mk

@@ -10,6 +10,7 @@ $(package)_patches=fix_qt_pkgconfig.patch mac-qmake.conf fix_no_printer.patch no
 $(package)_patches+= fix_android_qmake_conf.patch fix_android_jni_static.patch dont_hardcode_pwd.patch
 $(package)_patches+= drop_lrelease_dependency.patch no_sdk_version_check.patch
 $(package)_patches+= fix_qpainter_non_determinism.patch fix_lib_paths.patch fix_android_pch.patch
+$(package)_patches+= fix_bigsur_drawing.patch
 
 $(package)_qttranslations_file_name=qttranslations-$($(package)_suffix)
 $(package)_qttranslations_sha256_hash=e1de58ed108b7e0a138815ea60fd46a2c4e1fc31396a707e5630e92de79c53de
@@ -230,6 +231,7 @@ define $(package)_preprocess_cmds
   patch -p1 -i $($(package)_patch_dir)/fix_qpainter_non_determinism.patch &&\
   patch -p1 -i $($(package)_patch_dir)/no_sdk_version_check.patch && \
   patch -p1 -i $($(package)_patch_dir)/fix_lib_paths.patch && \
+  patch -p1 -i $($(package)_patch_dir)/fix_bigsur_drawing.patch && \
   sed -i.old "s|updateqm.commands = \$$$$\$$$$LRELEASE|updateqm.commands = $($(package)_extract_dir)/qttools/bin/lrelease|" qttranslations/translations/translations.pro && \
   mkdir -p qtbase/mkspecs/macx-clang-linux &&\
   cp -f qtbase/mkspecs/macx-clang/qplatformdefs.h qtbase/mkspecs/macx-clang-linux/ &&\

depends/patches/qt/fix_bigsur_drawing.patch

@@ -0,0 +1,31 @@
+Fix GUI stuck on Big Sur
+
+See:
+ - https://github.com/bitcoin-core/gui/issues/249
+ - https://github.com/bitcoin/bitcoin/pull/21495
+ - https://bugreports.qt.io/browse/QTBUG-87014
+
+We should be able to drop this once we are using one of the following versions:
+ - Qt 5.12.11 or later, see upstream commit: c5d904639dbd690a36306e2b455610029704d821
+ - Qt 5.15.3 or later, see upstream commit: 2cae34354bd41ae286258c7a6b3653b746e786ae
+
+--- a/qtbase/src/plugins/platforms/cocoa/qnsview_drawing.mm
++++ b/qtbase/src/plugins/platforms/cocoa/qnsview_drawing.mm
+@@ -95,8 +95,15 @@
+     // by AppKit at a point where we've already set up other parts of the platform plugin
+     // based on the presence of layers or not. Once we've rewritten these parts to support
+     // dynamically picking up layer enablement we can let AppKit do its thing.
+-    return QMacVersion::buildSDK() >= QOperatingSystemVersion::MacOSMojave
+-        && QMacVersion::currentRuntime() >= QOperatingSystemVersion::MacOSMojave;
++
++    if (QMacVersion::currentRuntime() >= QOperatingSystemVersion::MacOSBigSur)
++        return true; // Big Sur always enables layer-backing, regardless of SDK
++
++    if (QMacVersion::currentRuntime() >= QOperatingSystemVersion::MacOSMojave
++        && QMacVersion::buildSDK() >= QOperatingSystemVersion::MacOSMojave)
++        return true; // Mojave and Catalina enable layers based on the app's SDK
++
++    return false; // Prior versions needed explicitly enabled layer backing
+ }
+ 
+ - (BOOL)layerExplicitlyRequested