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c31cbe7cfeAdd C++17 test to Travis (Pieter Wuille)7829685e27Add configure option for c++17 (Pieter Wuille)0fbde488b2Support conversion between Spans of compatible types (Pieter Wuille)7cbfebbf3dUpdate ax_cxx_compile_stdcxx.m4 (Pieter Wuille) Pull request description: This adds a `--enable-c++17` option to the configure script, fixes the only C++17 incompatibility (with a commit taken from #18468), and adds a Travis test for it. This is all off by default, and release builds remain C++11. It implements the first step of the plan in https://github.com/bitcoin/bitcoin/issues/16684. ACKs for top commit: elichai: tACKc31cbe7cfepracticalswift: Tested ACKc31cbe7cfehebasto: ACKc31cbe7cfe, tested on Linux Mint 19.3 both C++11 and C++17 modes. Compiled and passed tests locally. Tree-SHA512: a4b00776dbceef9c12abbb404c6bcd48f7916ce24c8c7a14116355f64e817578b7fcddbedd5ce435322319d1e4de43429b68553f4d96d970c308fe3e3e59b9d1