Revert "Fix curl plugin in stable branch and re-enable it in config file. Ticket #3979"

This reverts commit 7df114882d4ba36e89b63ea32ce3cd672ebc1e0e.
Revert "Also add version history for curl fix. Ticket #3979"

This reverts commit b4bf409d96467bbea29fb14e40110045be537807.
Merge branch 'V8_0-branch'

Conflicts:
	src/condor_filetransfer_plugins/CMakeLists.txt
	src/condor_filetransfer_plugins/curl_plugin.c