libpq5.symbols: Put pqsignal back.

7 jobs for 12 in 60 minutes and 46 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #363150
build

00:31:01

 
  Test
passed #363154
autopkgtest

00:09:58

passed #363155
blhc

00:01:16

passed #363153
lintian

00:03:04

passed #363156
piuparts

00:22:49

passed #363152
test-build-all

00:12:05

passed #363151
test-build-any

00:29:44