Bug fixes:
----------

* fix source hash not being verified  #2367
* fix several references to arch that should be host_arch to support cross compiling (win-32 on win-64, for example)  #2369, #2368
* replace recipe run requirements with contents of index.json's "depends" when testing packages  #2370
* update R and perl versions in DEFAULT_VARIANTS  #2373
* fix versioneer showing unknown version on windows due to --match argument  #2375
* add subdir to moved work folder dirname, to avoid clobbering when cross compiling  #2376