postgresqlPackages: fix build of several PG plugins and add postgresql11Packages

Leftovers from 80aadbec60

`postgresql11Packages` are added to be built by Hydra as mainline PG plugins.

pkgs/servers/sql/postgresql/ext/cstore_fdw.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension

pkgs/servers/sql/postgresql/ext/pg_bigm.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   installPhase = ''
     mkdir -p $out/bin    # For buildEnv to setup proper symlinks. See #22653
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension

pkgs/servers/sql/postgresql/ext/pg_cron.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension

pkgs/servers/sql/postgresql/ext/pg_hll.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension

pkgs/servers/sql/postgresql/ext/pg_partman.nix

@@ -14,8 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/bin    # For buildEnv to setup proper symlinks. See #22653
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp src/*.so      $out/lib
     cp updates/*     $out/share/postgresql/extension

pkgs/servers/sql/postgresql/ext/pg_topn.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension

pkgs/servers/sql/postgresql/ext/temporal_tables.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   };
 
   installPhase = ''
-    mkdir -p $out/{bin,lib,share/extension}
+    mkdir -p $out/{lib,share/postgresql/extension}
 
     cp *.so      $out/lib
     cp *.sql     $out/share/postgresql/extension