$NetBSD$

https://github.com/Ultimaker/libSavitar/commit/91aa70c6320461ae65600dce954b5ffb905b7039.patch

Do not vendor the pugixml library

This prevents trying to co-install pugixml with existing system
libraries, and also fixes the includes for pugixml.hpp to actually use
the include path added by find_package/add_subdirectory instead of a
hardcoded relative path.
 
--- CMakeLists.txt.orig	2020-10-09 16:43:31.000000000 +0000
+++ CMakeLists.txt
@@ -15,7 +15,7 @@ if(BUILD_TESTS)
     find_package(Threads QUIET)
 endif()
 
-add_subdirectory(pugixml)
+find_package(pugixml REQUIRED)
 
 if(BUILD_PYTHON)
     list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)