Add r-quickjsr.

[cbrueffer]

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[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/r-quickjsr) and found it was in an excellent condition.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/r-quickjsr) and found some lint.

Here's what I've got...

For recipes/r-quickjsr:

• The following maintainers have not yet confirmed that they are willing to be listed here: conda-forge/r. Please ask them to comment on this PR if they are.

[mfansler]

@conda-forge/help-c-cpp having same issue here (as in r-stanheaders): clang can't find clock_gettime() on osx-64 despite -std=gnu11. Thanks in advance for any insight!

[mfansler]

@conda-forge/help-r this should be good now if anyone else wants to review.

Extra license follows how python-quickjs-feedstock handled the Python wrapper. Perhaps at some point we should spin off a quickjs and link against that, but right now this has been blocking RStan builds for several months and would like to prioritize getting those building again.

[cbrueffer]

Thanks @mfansler !