contrib/pugixml is now a submodule

Initially fixed at version 1.11.4 from 2020 because this seems to be Assimp’s current version. CMake required adding the PUGIXML_HEADER_ONLY preprocessor definition, which previously was hard-coded into the header.
krishty · dependabot · Apr 5, 2021 · Apr 14, 2021 · May 30, 2021 · May 30, 2021
commit 13dfc0dc3555e688386d339b140ca42303ad1f0c
diff --git a/.gitmodules b/.gitmodules
@@ -26,3 +26,6 @@
 [submodule "contrib/googletest"]
  path = contrib/googletest
  url = https://github.com/google/googletest.git
+[submodule "contrib/pugixml"]
+ path = contrib/pugixml
+ url = https://github.com/zeux/pugixml.git
diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
@@ -871,6 +871,7 @@ IF(ASSIMP_HUNTER_ENABLED)
  hunter_add_package(pugixml)
  find_package(pugixml CONFIG REQUIRED)
 ELSE()
+ ADD_DEFINITIONS(-DPUGIXML_HEADER_ONLY)
  SET( Pugixml_SRCS
  ../contrib/pugixml/src/pugiconfig.hpp
  ../contrib/pugixml/src/pugixml.hpp

diff --git a/contrib/pugixml b/contrib/pugixml
diff --git a/contrib/pugixml/CMakeLists.txt b/contrib/pugixml/CMakeLists.txt
diff --git a/contrib/pugixml/contrib/foreach.hpp b/contrib/pugixml/contrib/foreach.hpp
diff --git a/contrib/pugixml/readme.txt b/contrib/pugixml/readme.txt
diff --git a/contrib/pugixml/src/pugiconfig.hpp b/contrib/pugixml/src/pugiconfig.hpp