depends: patch around PlacementNew issue in capnp

See #31772 and https://github.com/capnproto/capnproto/pull/2235.

depends/packages/capnp.mk

@@ -4,6 +4,7 @@ $(package)_download_path=$(native_$(package)_download_path)
 $(package)_download_file=$(native_$(package)_download_file)
 $(package)_file_name=$(native_$(package)_file_name)
 $(package)_sha256_hash=$(native_$(package)_sha256_hash)
+$(package)_patches=abi_placement_new.patch
 
 define $(package)_set_vars :=
   $(package)_config_opts := -DBUILD_TESTING=OFF
@@ -12,6 +13,10 @@ define $(package)_set_vars :=
   $(package)_cxxflags += -fdebug-prefix-map=$($(package)_extract_dir)=/usr -fmacro-prefix-map=$($(package)_extract_dir)=/usr
 endef
 
+define $(package)_preprocess_cmds
+  patch -p2 < $($(package)_patch_dir)/abi_placement_new.patch
+endef
+
 define $(package)_config_cmds
   $($(package)_cmake) .
 endef