libkml: fall back to C++14

[jcar87]

This library uses features of C++ that are removed in C++17, and is currently failing building with MSVC with C++17 or higher.

in this PR: add fallback to compile with C++14 when anything higher than 14 is requested.

the compatibility.py extension in Conan 2 will fallback to the binary with C++14 on the consumer side.

In addition to the configurations tested by CI, this was locally tested on Windows with msvc with C++17.

[ghost]

I detected other pull requests that are modifying libkml/all recipe:

• libkml: add a patch for C++17 compatibility #23678
• libkml: use version range for expat, limit cpp standard to c++14 #23665

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 2 (de43deefd8fd93087595f02538a42e3ea9e4e3c5):

• libkml/1.3.0:
  All packages built successfully! (All logs)

---

Conan v2 pipeline ✔️

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

All green in build 2 (de43deefd8fd93087595f02538a42e3ea9e4e3c5):

• libkml/1.3.0:
  All packages built successfully! (All logs)