vcs-svn: teach line_buffer to handle multiple input files

vcs-svn: teach line_buffer to handle multiple input files

Collect the line_buffer state in a newly public line_buffer struct.
Callers can use multiple line_buffers to manage input from multiple
files at a time.

svn-fe's delta applier will use this to stream a delta from svnrdump
and the preimage it applies to from fast-import at the same time.

The tests don't take advantage of the new features, but I think that's
okay.  It is easier to find lingering examples of nonreentrant code by
searching for "static" in line_buffer.c.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>