Add jsonnet/0.17.0

[vcampmany]

Specify library name and version: jsonnet/0.17.0

jsonnet is a data templating language based on json: https://jsonnet.org

---

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[CLAassistant]

All committers have signed the CLA.

[uilianries]

Thank you for your contribution, please, take a look on my review

[uilianries]

Suggested change

	std::cout << jsonnet::Jsonnet::version() << "\n";
	std::cout << jsonnet::Jsonnet::version() << "\n";

It's not available for GCC5 + libstdc++. Only works with libstdc++11

Besides that, both libjsonnet++.so and libjsonnet.so require libstdc++

ldd lib/libjsonnet.so
linux-vdso.so.1 => (0x00007ffde2908000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f8b93523000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8b9321a000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8b93004000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8b92c3a000)
/lib64/ld-linux-x86-64.so.2 (0x00007f8b93b75000)

ldd lib/libjsonnet++.so
linux-vdso.so.1 => (0x00007ffc61d7f000)
libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fa4dc271000)
libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fa4dc05b000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fa4dbc91000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fa4db988000)
/lib64/ld-linux-x86-64.so.2 (0x00007fa4dc7f7000)

[SSE4]

what exactly is not available? I don't see what have you changed in your suggestion

[madebr]

This can be removed

[madebr]

Suggested change

	raise ConanInvalidConfiguration("jsonnet does not support cross building")
	if self.settings.compiler in ["clang", "apple-clang"] and self.settings.compiler.libcxx != "libstdc++":
	raise ConanInvalidConfiguration("jsonnet {} package requires libstdc++".
	format(self.settings.compiler))
	if self.settings.compiler.cppstd:
	raise ConanInvalidConfiguration("jsonnet does not support cross building")
	if self.settings.compiler.cppstd:

[madebr]

I just tested with gcc 5 and clang 3.9, and it worked flawlessly.

To trigger c3i (CI), please close this pr, wait 10 seconds and re-open it.

[conan-center-bot]

All green in build 18 (d3a2f05d266e56b9c7b38510ca02b3d080f65420):

• jsonnet/0.17.0@:
  All packages built successfully! (All logs)