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Make our configure.ac script use the portable `=` comparison

Back in 0.4.5.1-alpha we added an `==` comparison, which isn't
portable.

Fixes bug #40298; bugfix on 0.4.5.1-alpha.
9 jobs for bug40298_045 in 20 minutes and 2 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #12412
debian-disable-dirauth

00:06:22

passed #12413
debian-disable-relay

00:06:20

passed #12408
debian-distcheck

00:07:55

passed #12409
debian-docs

00:03:02

passed #12407
debian-hardened

00:08:02

passed #12410
debian-integration

00:15:29

passed #12406
debian-minimal

00:06:30

passed #12414
debian-nss

00:05:36

passed #12411
debian-tracing

00:08:31