Externals: Add zeux/pugixml@38edf25

Along with VS boilerplate to get it to build on Windows.

Externals/pugixml/CMakeLists.txt

@@ -0,0 +1,42 @@
+project(pugixml)
+
+cmake_minimum_required(VERSION 2.6)
+
+option(BUILD_SHARED_LIBS "Build shared instead of static library" OFF)
+
+set(BUILD_DEFINES "" CACHE STRING "Build defines")
+
+if(MSVC)
+	option(STATIC_CRT "Use static CRT libraries" OFF)
+
+	# Rewrite command line flags to use /MT if necessary
+	if(STATIC_CRT)
+		foreach(flag_var
+				CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
+				CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
+			if(${flag_var} MATCHES "/MD")
+				string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
+			endif(${flag_var} MATCHES "/MD")
+		endforeach(flag_var)
+	endif()
+endif()
+
+set(HEADERS pugixml.hpp pugiconfig.hpp)
+set(SOURCES ${HEADERS} pugixml.cpp)
+
+if(DEFINED BUILD_DEFINES)
+	foreach(DEFINE ${BUILD_DEFINES})
+		add_definitions("-D" ${DEFINE})
+	endforeach()
+endif()
+
+if(BUILD_SHARED_LIBS)
+	add_library(pugixml SHARED ${SOURCES})
+else()
+	add_library(pugixml STATIC ${SOURCES})
+endif()
+
+set_target_properties(pugixml PROPERTIES VERSION 1.8 SOVERSION 1)
+get_target_property(PUGIXML_VERSION_STRING pugixml VERSION)
+
+target_include_directories(pugixml PUBLIC ./)