Simplify newline handling in two TAP tests

Simplify newline handling in two TAP tests

Two tests are changed in this commit:
- libpq's 006_service
- ldap's 003_ldap_connection_param_lookup

CRLF translation is already handled by the text mode, so there should be
need for any specific logic.  See also 1c6d4629394d, msys perl being one
case where the translation mattered.

Note: This is first applied on HEAD, and backpatch will follow once the
buildfarm has provided an opinion about this commit.

Author: Jacob Champion <jacob.champion@enterprisedb.com>
Co-authored-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/aPsh39bxwYKvUlAf@paquier.xyz
Backpatch-through: 13