Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Bug-Submit (from ./configure), Repository-Browse. (upstream-metadata-file-is-missing)
• 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 (out-of-date-standards-version)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/44/da7987e3f90442c63bbdc5f97fa68c3b8b1d2c.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/44/d42a1d6a3c58a6020814e9f4c4be463084723b.debug

No differences were encountered between the control files of package **ibus-pinyin**

Control files of package ibus-pinyin-dbgsym: lines which differ (wdiff format)

• Build-Ids: 44d42a1d6a3c58a6020814e9f4c4be463084723b 44da7987e3f90442c63bbdc5f97fa68c3b8b1d2c

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/ibus-pinyin/5c05d1d3-cbbf-4318-96e4-3e608ab3b398.