Fix some issues reported by lintian

Fix some issues reported by lintian

• Update lintian override info format in d/slang-xfig.lintian-overrides on line 4. (mismatched-override)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/26/a9b0a18b4a0d09af5aa0f19d8192572a0fec36.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/ed/947dabe1656957931ccad82a96167debc9f88b.debug

No differences were encountered between the control files of package **slang-xfig**

Control files of package slang-xfig-dbgsym: lines which differ (wdiff format)

• Build-Ids: ed947dabe1656957931ccad82a96167debc9f88b 26a9b0a18b4a0d09af5aa0f19d8192572a0fec36

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