I think that software that falls under the definition of publically available--I can go dig up a citation if you really care--can be exported almost anywhere or at least sufficiently almost anywhere that we ignore the problem. The only exception to this in the EAR regulations at all seems to be cryptographic software.
If the export restrictions are a legal note and are not intended to be part of the license then upload it to main. If the legal restrictions are part of the license then you need to go carefully read the GPL; I believe there may be an exception that allows you to upload to non-us, but I may be wrong.
