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dwarf_add_file_decl(3) on FreeBSD

The text 98b677c4fa92, as FreeBSD 12.0-RELEASE, FreeBSD 11.4-RELEASE, FreeBSD 11.3-RELEASE, FreeBSD 11.2-RELEASE, FreeBSD 11.1-RELEASE, FreeBSD 11.0-RELEASE shipped it.

add a source file entry to a producer instance

dwarf_add_file_decl(3) on FreeBSD now