Update Ncurses ref to self.deps_lib_dir

Author: jwiltse

src/portable_python/external/xcpython.py

@@ -219,7 +219,7 @@ def c_configure_args(self):
             yield "--without-manpages"
             yield "--without-progs"
             yield "--without-tests"
-            yield f"--with-pkg-config-libdir={self.deps_lib}/pkgconfig"
+            yield f"--with-pkg-config-libdir={self.deps_lib_dir}/pkgconfig"
             yield "--enable-pc-files"
             yield "--with-debug=no"
             yield "--with-gpm=no"