[MacPorts] #33671: libpqxx: update to 4.0

[MacPorts]

#33671: libpqxx: update to 4.0
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 Reporter:  ryandesign@…             |       Owner:  dweber@…           
     Type:  update                   |      Status:  new                
 Priority:  Normal                   |   Milestone:                     
Component:  ports                    |     Version:                     
 Keywords:  haspatch                 |        Port:  libpqxx            
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Changes (by ryandesign@…):

  * keywords:  => haspatch


Comment:

 Attached is a patch to update libpqxx to version 4.0.

  * Removed the unnecessary distname line.
  * Updated to rmd160/sha256 checksum types.
  * Added variants for postgresql83/84/90/91, making 91, the current stable
 version, the default; left old pq83 variant to help users upgrading; this
 variant should be removed after everyone has upgraded, for example in one
 year.
  * Patched maketemporary to avoid an error message about improper use of
 the mktemp command; apparently maketemporary is designed to call mktemp
 various ways, some of which may be improper, as it attempts to determine
 how to use it properly; we don't want to see those errors in the configure
 phase output.
  * Patched splitconfig to avoid usage of "echo -n" which is not POSIX-
 compliant, thus causing incorrect output on Snow Leopard and later.
  * Patched configure on darwin to fix incorrect assumption that true and
 false always live in /bin; on OS X they live in /usr/bin.

 In addition I believe this fixes the build failure with clang reported in
 #32689.

 I believe these changes are ready to be committed.

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Ticket URL: <https://trac.macports.org/ticket/33671#comment:2>
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