Fix ';' handling at first continuation line
In RawConfigParser: # ';' is a comment delimiter only if it follows # a spacing character and this applies only on the first line of the value. By escaping the first newline, which is by the way useless and ugly, a ';' on the second line (i.e. the first continuation line) would be saved on the first line in .installed.cfg. This resulted in parts being reinstalled without reason. WARNING: Newer versions of buildout don't use RawConfigParser anymore so it may not be affected by this bug and in any case, this commit must not be cherry-picked blindly.
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