[Github-comments] [geany/geany] Update C++ compiler check to require C++17 (#2862)

[Matthew Brush]

C++17 equivalent of previous Autoconf check that we got from the [Autoconf Archive](https://www.gnu.org/software/autoconf-archive), which has since been factored into two m4 files:

  * [ax_cxx_compile_stdcxx](https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html)
  * [ax_cxx_compile_stdcxx_17](https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_17.html)

I didn't look to see if C++11 is mentioned in any docs and update them, feel free to modify to this PR to fix them, or mention in comments and I'll try and fix.
You can view, comment on, or merge this pull request online at:

  https://github.com/geany/geany/pull/2862

-- Commit Summary --

  * Update C++ compiler check to require C++17

-- File Changes --

    M configure.ac (2)
    A m4/ax_cxx_compile_stdcxx.m4 (962)
    D m4/ax_cxx_compile_stdcxx_11.m4 (142)
    A m4/ax_cxx_compile_stdcxx_17.m4 (35)

-- Patch Links --

https://github.com/geany/geany/pull/2862.patch
https://github.com/geany/geany/pull/2862.diff

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