Fix some issues reported by lintian

Fix some issues reported by lintian

• Re-export upstream signing key without extra signatures. (public-upstream-key-not-minimal)
• Avoid explicitly specifying -Wl,--as-needed linker flag. (debian-rules-uses-as-needed-linker-flag)

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/d0302bda763d8cafa4d5015284a1f7113e9b39.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/5e/4772039d6d79b7696f4589f1affe1db94c3923.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/d3/668dcb381878b2686134f50179b8fed0dea61d.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/4d/1fbc6aa5756be995d1166fc9e7317caa3d28bf.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/56/49cca09a1b059a2ba4fe63d904c3e79943ce2e.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/fd/bb6a8d6cabc581a63f02fcc580c04c82551380.debug

No differences were encountered between the control files of package **kdf**

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

• Build-Ids: 4d1fbc6aa5756be995d1166fc9e7317caa3d28bf 5649cca09a1b059a2ba4fe63d904c3e79943ce2e 26d0302bda763d8cafa4d5015284a1f7113e9b39 5e4772039d6d79b7696f4589f1affe1db94c3923 bcf2c5be9151d4e68e890839ff133bdc15e03284 fdbb6a8d6cabc581a63f02fcc580c04c82551380 d3668dcb381878b2686134f50179b8fed0dea61d

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