depends: expat 2.7.3

Remove the patch, as expat has bumped it's minimum to 3.15.
Remove the lto related workaround. I haven't seen issues with CMakes
TestBigEndian.

depends/packages/expat.mk

@@ -1,23 +1,14 @@
 package=expat
-$(package)_version=2.4.8
+$(package)_version=2.7.3
 $(package)_download_path=https://github.com/libexpat/libexpat/releases/download/R_$(subst .,_,$($(package)_version))/
-$(package)_file_name=$(package)-$($(package)_version).tar.xz
+$(package)_file_name=$(package)-$($(package)_version).tar.gz
-$(package)_sha256_hash=f79b8f904b749e3e0d20afeadecf8249c55b2e32d4ebb089ae378df479dcaf25
+$(package)_sha256_hash=821ac9710d2c073eaf13e1b1895a9c9aa66c1157a99635c639fbff65cdbdd732
 $(package)_build_subdir=build
-$(package)_patches += cmake_minimum.patch
 
-# -D_DEFAULT_SOURCE defines __USE_MISC, which exposes additional
-# definitions in endian.h, which are required for a working
-# endianness check in configure when building with -flto.
 define $(package)_set_vars
   $(package)_config_opts := -DCMAKE_BUILD_TYPE=None -DEXPAT_BUILD_TOOLS=OFF
   $(package)_config_opts += -DEXPAT_BUILD_EXAMPLES=OFF -DEXPAT_BUILD_TESTS=OFF
   $(package)_config_opts += -DBUILD_SHARED_LIBS=OFF
-  $(package)_cppflags += -D_DEFAULT_SOURCE
-endef
-
-define $(package)_preprocess_cmds
-  patch -p1 < $($(package)_patch_dir)/cmake_minimum.patch
 endef
 
 define $(package)_config_cmds

depends/patches/expat/cmake_minimum.patch

@@ -1,13 +0,0 @@
-build: set minimum required CMake to 3.16
-
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -33,7 +33,7 @@
- # Unlike most of Expat,
- # this file is copyrighted under the BSD-license for buildsystem files of KDE.
- 
--cmake_minimum_required(VERSION 3.1.3)
-+cmake_minimum_required(VERSION 3.16)
- 
- # This allows controlling documented build time switches
- # when Expat is pulled in using the add_subdirectory function, e.g.