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build: begin using -std=c++17 and c17 in Makefile builds (#2648)
Begin using -std=c++17 and -std=c17 in Makefile builds on all platforms. Bazel builds have been using C++17 since 52c9568. Set `-stdlib=libc++ on xt-clang` on Xtensa to add C++17 library support in addition to compiler support. From the xt-clang docs: Starting with the RI-2019.1 release, XT-CLANG has included support for C++14 and C++17 language features. The compiler support for C++14 and C++17 is accompanied by the C++ library from the LLVM project. This library can be selected with the -stdlib=libc++ option, and this is strongly recommended when compiling with -std=c++14 or - std=c++17. Starting with the RI-2021.6 release, two additional versions of this C++ library are provided— one that excludes support for exception handling, and one that excludes both exception handling and run-time type identification. These libraries can be selected with -stdlib=libc ++-e and -stdlib=libc++-re options respectively. Based on the `docker run` command in tflite-micro/.github/workflows/xtensa_presubmit.yml, our CI is currently using RI-2020.4. Refactor the make/ext_libs/xtensa_download.sh script to make it eaiser to patch downloads for all Xtensa platforms. The old script made overly strict assumptions about the name of the patch. Patch the Xtensa vision_p6 platform download xi_tflmlib_vision_p6 for compatibility with the C++ library standard. Use the header <climits> to access constants such as INT_MAX. BUG=#2650
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