unixODBCDrivers.psql: merge with psqlodbc

The former hasn't been updated in years and broke with the upgrade of
`pkgs.postgresql` to v16 subsequently breaking `qtbase`[1].

There's already `pkgs.psqlodbc` which seems to be the same, but kept
up-to-date and linked against libiodbc. Modify `pkgs.psqlodbc` to
provide both libiodbc and unixodbc variants.

[1] https://github.com/NixOS/nixpkgs/pull/329611#issuecomment-2267513284

pkgs/development/libraries/psqlodbc/default.nix

@@ -1,4 +1,9 @@
-{ lib, stdenv, fetchurl, libiodbc, postgresql, openssl }:
+{ lib, stdenv, fetchurl, postgresql, openssl
+, withLibiodbc ? false, libiodbc
+, withUnixODBC ? true, unixODBC
+}:
+
+assert lib.xor withLibiodbc withUnixODBC;
 
 stdenv.mkDerivation rec {
   pname = "psqlodbc";
@@ -9,18 +14,28 @@ stdenv.mkDerivation rec {
     hash = "sha256-r9iS+J0uzujT87IxTxvVvy0CIBhyxuNDHlwxCW7KTIs=";
   };
 
-  buildInputs = [ libiodbc postgresql openssl ];
+  buildInputs = [
+    postgresql
+    openssl
+  ]
+  ++ lib.optional withLibiodbc libiodbc
+  ++ lib.optional withUnixODBC unixODBC;
+
+  passthru = lib.optionalAttrs withUnixODBC {
+    fancyName = "PostgreSQL";
+    driver = "lib/psqlodbcw.so";
+  };
 
   configureFlags = [
-    "--with-iodbc=${libiodbc}"
     "--with-libpq=${lib.getDev postgresql}/bin/pg_config"
-  ];
+  ]
+  ++ lib.optional withLibiodbc "--with-iodbc=${libiodbc}";
 
   meta = with lib; {
     homepage = "https://odbc.postgresql.org/";
     description = "ODBC driver for PostgreSQL";
     license = licenses.lgpl2;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     maintainers = [ ];
   };
 }

pkgs/development/libraries/unixODBCDrivers/default.nix

@@ -1,4 +1,4 @@
-{ fetchurl, stdenv, unixODBC, cmake, postgresql, mariadb, sqlite, zlib, libxml2, dpkg, lib, openssl, libkrb5, libuuid, patchelf, libiconv, fixDarwinDylibNames, fetchFromGitHub }:
+{ fetchurl, stdenv, unixODBC, cmake, mariadb, sqlite, zlib, libxml2, dpkg, lib, openssl, libkrb5, libuuid, patchelf, libiconv, fixDarwinDylibNames, fetchFromGitHub, psqlodbc }:
 
 # Each of these ODBC drivers can be configured in your odbcinst.ini file using
 # the various passthru and meta values. Of note are:
@@ -16,30 +16,7 @@
 # ''
 
 {
-  psql = stdenv.mkDerivation rec {
-    pname = "psqlodbc";
-    version = "10.01.0000";
-
-    src = fetchurl {
-      url = "mirror://postgresql/odbc/versions/src/${pname}-${version}.tar.gz";
-      sha256 = "1cyams7157f3gry86x64xrplqi2vyqrq3rqka59gv4lb4rpl7jl7";
-    };
-
-    buildInputs = [ unixODBC postgresql ];
-
-    # see the top of the file for an explanation
-    passthru = {
-      fancyName = "PostgreSQL";
-      driver = "lib/psqlodbcw.so";
-    };
-
-    meta = with lib; {
-      description = "Official PostgreSQL ODBC Driver";
-      homepage = "https://odbc.postgresql.org/";
-      license = licenses.lgpl2;
-      platforms = platforms.unix;
-    };
-  };
+  psql = psqlodbc.override { withUnixODBC = true; withLibiodbc = false; };
 
   mariadb = stdenv.mkDerivation rec {
     pname = "mariadb-connector-odbc";