postgresql: Respect dontDisableStatic

pkgs/servers/sql/postgresql/default.nix

@@ -58,13 +58,15 @@ let
         # Prevent a retained dependency on gcc-wrapper.
         substituteInPlace "$out/lib/pgxs/src/Makefile.global" --replace ${stdenv.cc}/bin/ld ld
 
-        # Remove static libraries in case dynamic are available.
-        for i in $out/lib/*.a; do
-          name="$(basename "$i")"
-          if [ -e "$lib/lib/''${name%.a}.so" ] || [ -e "''${i%.a}.so" ]; then
-            rm "$i"
-          fi
-        done
+        if [ -z "''${dontDisableStatic:-}" ]; then
+          # Remove static libraries in case dynamic are available.
+          for i in $out/lib/*.a; do
+            name="$(basename "$i")"
+            if [ -e "$lib/lib/''${name%.a}.so" ] || [ -e "''${i%.a}.so" ]; then
+              rm "$i"
+            fi
+          done
+        fi
       '';
 
     postFixup = lib.optionalString (!stdenv.isDarwin)