depends: patch boost to ignore -Wnonnull new gcc 11 warnings

this patch fixes errors like:

```
include/boost/concept/detail/general.hpp:39:47: warning: 'this' pointer null [-Wnonnull]
   39 |     static void failed() { ((Model*)0)->~Model(); }
```

during build with gcc 11.x, more details can be found here:

- boostorg/concept_check#27
- boostorg/concept_check#28

depends/packages/boost.mk

@@ -3,7 +3,7 @@ $(package)_version=1_74_0
 $(package)_download_path=https://boostorg.jfrog.io/artifactory/main/release/$(subst _,.,$($(package)_version))/source/
 $(package)_file_name=boost_$($(package)_version).tar.bz2
 $(package)_sha256_hash=83bfc1507731a0906e387fc28b7ef5417d591429e51e788417fe9ff025e116b1
-$(package)_patches=signals2-noise.patch
+$(package)_patches=signals2-noise.patch ignore_wnonnull_gcc_11.patch
 
 
 define $(package)_set_vars
@@ -29,6 +29,7 @@ endef
 
 define $(package)_preprocess_cmds
   patch -p2 < $($(package)_patch_dir)/signals2-noise.patch && \
+  patch -p2 < $($(package)_patch_dir)/ignore_wnonnull_gcc_11.patch && \
   echo "using $(boost_toolset_$(host_os)) : : $($(package)_cxx) : <cxxflags>\"$($(package)_cxxflags) $($(package)_cppflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$(boost_archiver_$(host_os))\" <striper>\"$(host_STRIP)\"  <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
 endef
 
@@ -50,4 +51,4 @@ endef
 define $(package)_stage_cmds
   ./b2 -d0 -j4 --prefix=$($(package)_staging_prefix_dir) $($(package)_config_opts) install
 endef
-endif
+endif

depends/patches/boost/ignore_wnonnull_gcc_11.patch

@@ -0,0 +1,68 @@
+diff --git a/include/boost/concept/detail/general.hpp b/include/boost/concept/detail/general.hpp
+index eeb08750..8d7d6f69 100644
+--- a/include/boost/concept/detail/general.hpp
++++ b/include/boost/concept/detail/general.hpp
+@@ -28,7 +28,14 @@ namespace detail
+ template <class Model>
+ struct requirement
+ {
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic push
++#   pragma GCC diagnostic ignored "-Wnonnull"
++#   endif
+     static void failed() { ((Model*)0)->~Model(); }
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic pop
++#   endif
+ };
+
+ struct failed {};
+@@ -36,7 +43,14 @@ struct failed {};
+ template <class Model>
+ struct requirement<failed ************ Model::************>
+ {
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic push
++#   pragma GCC diagnostic ignored "-Wnonnull"
++#   endif
+     static void failed() { ((Model*)0)->~Model(); }
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic pop
++#   endif
+ };
+
+ # ifdef BOOST_OLD_CONCEPT_SUPPORT
+@@ -44,7 +58,14 @@ struct requirement<failed ************ Model::************>
+ template <class Model>
+ struct constraint
+ {
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic push
++#   pragma GCC diagnostic ignored "-Wnonnull"
++#   endif
+     static void failed() { ((Model*)0)->constraints(); }
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic pop
++#   endif
+ };
+
+ template <class Model>
+diff --git a/include/boost/concept/usage.hpp b/include/boost/concept/usage.hpp
+index 373de63a..fe88b5f5 100644
+--- a/include/boost/concept/usage.hpp
++++ b/include/boost/concept/usage.hpp
+@@ -13,7 +13,14 @@ namespace boost { namespace concepts {
+ template <class Model>
+ struct usage_requirements
+ {
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic push
++#   pragma GCC diagnostic ignored "-Wnonnull"
++#   endif
+     ~usage_requirements() { ((Model*)0)->~Model(); }
++#   if defined(BOOST_GCC) && (BOOST_GCC >= 110000)
++#   pragma GCC diagnostic pop
++#   endif
+ };
+
+ #  if BOOST_WORKAROUND(__GNUC__, <= 3)