postgresql: flatten generic.nix

Removes all the indentation in generic.nix, which is possible because
we're not calling the generic function recursively anymore anyway.

pkgs/servers/sql/postgresql/14.nix

@@ -1,4 +1,4 @@
-import ./generic.nix {
+{
   version = "14.23";
   rev = "refs/tags/REL_14_23";
   hash = "sha256-fjoboaUhrHFDqusmIXzSS5ZnIpSRHO9+qcqvkchl2dM=";

pkgs/servers/sql/postgresql/15.nix

@@ -1,4 +1,4 @@
-import ./generic.nix {
+{
   version = "15.18";
   rev = "refs/tags/REL_15_18";
   hash = "sha256-tw1zzgLXx7Jr4bi8rMKRmTJzOSQFGvrP2nHr9FcVrjs=";

pkgs/servers/sql/postgresql/16.nix

@@ -1,4 +1,4 @@
-import ./generic.nix {
+{
   version = "16.14";
   rev = "refs/tags/REL_16_14";
   hash = "sha256-g2+OdB2dGIKBSFJ24Z3Yy7oRAFywNMSVDdWfnsaeJJQ=";

pkgs/servers/sql/postgresql/17.nix

@@ -1,4 +1,4 @@
-import ./generic.nix {
+{
   version = "17.10";
   rev = "refs/tags/REL_17_10";
   hash = "sha256-3ZAqlT3R8ywhNH13oqz2VUbSwpOJ2JaICbxZ29awaMw=";

pkgs/servers/sql/postgresql/18.nix

@@ -1,4 +1,4 @@
-import ./generic.nix {
+{
   version = "18.4";
   rev = "refs/tags/REL_18_4";
   hash = "sha256-Ac/Dqcj8vjcW3my5vsnKaMiQqTq/HPtUzckJ3SMyrfA=";

pkgs/servers/sql/postgresql/19.nix

@@ -1,4 +1,4 @@
-import ./generic.nix {
+{
   version = "19beta1";
   rev = "refs/tags/REL_19_BETA1";
   hash = "sha256-thvbttX8wwGLf5tMJRHl86Xv8OgINzahoqB/AzAdtMI=";

pkgs/servers/sql/postgresql/default.nix

@@ -23,7 +23,7 @@ let
       version: path:
       let
         attrName = if jitSupport then "${version}_jit" else version;
-        postgresql = import path { inherit self; };
+        postgresql = self.callPackage ./generic.nix (import path // { inherit self; });
         attrValue = if jitSupport then postgresql.withJIT else postgresql;
       in
       self.lib.nameValuePair attrName attrValue