devel/ruby-install: Update to 0.9.1

• While I'm here:
  • Use upstream release tarball
  • Use tab instead of space
  • Add NO_ARCH
  • Add NO_BUILD
  • Use INSTALL_MAN: COPYTREE_BIN brings incorrect file mode (+x) to ruby-install.1.gz
  • Use . instead of \*
  • Use DATADIR

Changes: https://github.com/postmodern/ruby-install/releases
PR: 273273
Reported by: Henry Phan <henry@henryphan.com> (maintainer)