Merge bitcoin/bitcoin#22186: build, qt: Fix compiling qt package in depends with GCC 11

d1d1cc9 build, qt: Fix compiling qt package in depends with GCC 11 (Hennadii Stepanov)

Pull request description:

  The `qt` package in depends fails to compile with GCC 11 due to the missed `<limits>` headers.

  See: https://bugreports.qt.io/browse/QTBUG-90395

  Affected systems:
  - Ubuntu 21.04 + GCC 11.1.0
  - Fedora 34 + GCC 11.1.1

  Ubuntu 21.04 build log excerpt:
  ```
  Configuring qt...
  Creating qmake...
  gmake[1]: Entering directory '/home/hebasto/bitcoin/depends/work/build/x86_64-pc-linux-gnu/qt/5.12.11-1ff5c6c1f55/qtbase/qmake'
  In file included from /home/hebasto/bitcoin/depends/work/build/x86_64-pc-linux-gnu/qt/5.12.11-1ff5c6c1f55/qtbase/include/QtCore/qendian.h:1,
                   from /home/hebasto/bitcoin/depends/work/build/x86_64-pc-linux-gnu/qt/5.12.11-1ff5c6c1f55/qtbase/src/corelib/codecs/qutfcodec.cpp:43:
  /home/hebasto/bitcoin/depends/work/build/x86_64-pc-linux-gnu/qt/5.12.11-1ff5c6c1f55/qtbase/include/QtCore/../../src/corelib/global/qendian.h: In static member function ‘static constexpr QSpecialInteger<S> QSpecialInteger<S>::max()’:
  /home/hebasto/bitcoin/depends/work/build/x86_64-pc-linux-gnu/qt/5.12.11-1ff5c6c1f55/qtbase/include/QtCore/../../src/corelib/global/qendian.h:331:35: error: ‘numeric_limits’ is not a member of ‘std’
    331 |     { return QSpecialInteger(std::numeric_limits<T>::max()); }
        |                                   ^~~~~~~~~~~~~~
  /home/hebasto/bitcoin/depends/work/build/x86_64-pc-linux-gnu/qt/5.12.11-1ff5c6c1f55/qtbase/include/QtCore/../../src/corelib/global/qendian.h:331:54: error: ‘::max’ has not been declared; did you mean ‘std::max’?
    331 |     { return QSpecialInteger(std::numeric_limits<T>::max()); }
        |                                                      ^~~
        |                                                      std::max
  ```

ACKs for top commit:
  fanquake:
    ACK d1d1cc9

Tree-SHA512: 2dd643efc0aefc492f9565c0900ba0f1657c016bc4a44792f85478b9fc6e0e4ecad78847114ef6ec702d2de4cdbc3f657e9b96634ea58f42b6cc98dfb5e09eab

Author: fanquake

depends/packages/qt.mk

@@ -10,7 +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
 $(package)_patches+= fix_lib_paths.patch fix_android_pch.patch
-$(package)_patches+= qtbase-moc-ignore-gcc-macro.patch
+$(package)_patches+= qtbase-moc-ignore-gcc-macro.patch fix_limits_header.patch
 
 $(package)_qttranslations_file_name=qttranslations-$($(package)_suffix)
 $(package)_qttranslations_sha256_hash=577b0668a777eb2b451c61e8d026d79285371597ce9df06b6dee6c814164b7c3
@@ -231,6 +231,7 @@ define $(package)_preprocess_cmds
   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)/qtbase-moc-ignore-gcc-macro.patch && \
+  patch -p1 -i $($(package)_patch_dir)/fix_limits_header.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_limits_header.patch

@@ -0,0 +1,44 @@
+Fix compiling with GCC 11
+
+See: https://bugreports.qt.io/browse/QTBUG-90395.
+
+Upstream commits:
+ - Qt 5.15 -- unavailable as open source
+ - Qt 6.0: b2af6332ea37e45ab230a7a5d2d278f86d961b83
+ - Qt 6.1: 9c56d4da2ff631a8c1c30475bd792f6c86bda53c
+
+--- old/qtbase/src/corelib/global/qendian.h
++++ new/qtbase/src/corelib/global/qendian.h
+@@ -44,6 +44,8 @@
+ #include <QtCore/qfloat16.h>
+ #include <QtCore/qglobal.h>
+ 
++#include <limits>
++
+ // include stdlib.h and hope that it defines __GLIBC__ for glibc-based systems
+ #include <stdlib.h>
+ #include <string.h>
+
+--- old/qtbase/src/corelib/tools/qbytearraymatcher.h
++++ new/qtbase/src/corelib/tools/qbytearraymatcher.h
+@@ -42,6 +42,8 @@
+ 
+ #include <QtCore/qbytearray.h>
+ 
++#include <limits>
++
+ QT_BEGIN_NAMESPACE
+ 
+ 
+
+--- old/qtbase/src/tools/moc/generator.cpp
++++ new/qtbase/src/tools/moc/generator.cpp
+@@ -40,6 +40,8 @@
+ #include <QtCore/qplugin.h>
+ #include <QtCore/qstringview.h>
+ 
++#include <limits>
++
+ #include <math.h>
+ #include <stdio.h>
+