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b2e129fe4f
Many of the more complicated CMake projects can't be added to the IDF build system simply by calling add_subdirectory. "add_subdirectory" also cannot be used with projects which use build systems other than CMake (for example GNU Make or cargo). This commit changes the example to use ExternalProject_Add, instead, which is a more general way of adding subprojects. As part of this change, tinyxml2 is now downloaded from the Internet, which allows removing one submodule.