postgresql: Don't move libs unnecessarily out of $lib.

In particular, when static linking pkgconfig expects libpq.a in $lib

pkgs/servers/sql/postgresql/default.nix

@@ -76,7 +76,8 @@ let
     postInstall =
       ''
         moveToOutput "lib/pgxs" "$out" # looks strange, but not deleting it
-        moveToOutput "lib/*.a" "$out"
+        moveToOutput "lib/libpgcommon.a" "$out"
+        moveToOutput "lib/libpgport.a" "$out"
         moveToOutput "lib/libecpg*" "$out"
 
         # Prevent a retained dependency on gcc-wrapper.
@@ -84,7 +85,7 @@ let
 
         if [ -z "''${dontDisableStatic:-}" ]; then
           # Remove static libraries in case dynamic are available.
-          for i in $out/lib/*.a; do
+          for i in $out/lib/*.a $lib/lib/*.a; do
             name="$(basename "$i")"
             ext="${stdenv.hostPlatform.extensions.sharedLibrary}"
             if [ -e "$lib/lib/''${name%.a}$ext" ] || [ -e "''${i%.a}$ext" ]; then