Avoid extra newline in errors received in FE protocol version 2.

Contrary to what the comment said, the postmaster does in fact end all
its messages in a newline, since server version 7.2. Be tidy and don't
add an extra newline if the error message already has one.

Discussion: 
https://www.postgresql.org/message-id/CAFBsxsEdgMXc%2BtGfEy9Y41i%3D5pMMjKeH8t8vSAypR3ZnAoQnHg%40mail.gmail.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/85d94c575302644e7ddb4392c3bda572f981ec34

Modified Files
--------------
src/interfaces/libpq/fe-connect.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

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