devel/arduino: fix DOS2UNIX_REGEX, update atmega644 boards patch
- Many installed source files had CRLF line endings. This was due to too much escaping in DOS2UNIX_REGEX. Reduce the list of extensions to just the ones that need it and add (lower case) makefile.
- Update optional 644 boards.txt patch to be like the atmega328 version. Only add one board called atmega644 with the mcu set to atmega644p.
- Bump PORTREVISION
PR: 217817
Submitted by: Craig Leres <leres@ee.lbl.gov> (maintainer)