Add missing leading _ to some _lp_line_count

Merged Johann Dreo requested to merge github/fork/milouse/fix/lp_count_lines into master

Created by: milouse

It seems _lp_line_count was renamed to __lp_line_count (doubling the leading _) without a full renaming amount the source. Thus some old usage of the old name still exists in mercurial, fossil or SVN functions.

This MR fixes all these function call.

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