xbps-src: added XBPS_COMMONVARSDIR that sources all .sh files in
setup_tmpl(), this replaces tmpl_funcs.sh.
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extra : convert_revision : xtraeme%40gmail.com-20091012203056-rtay2drhrwak4ldk
When it's set, a custom do_fetch() function must be used to fetch
sources. $distfiles and $checksum will be ignored in that case.
This makes it able to fetch sources from git, svn, bzr, etc.
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extra : convert_revision : xtraeme%40gmail.com-20091012102321-zqp4r783uo1s4sek