gnu: fontforge: Build with Python 2.

* gnu/packages/fontutils.scm (fontforge)[inputs]: Replace python-wrapper with
python-2.

gnu/packages/fontutils.scm

@@ -536,7 +536,10 @@ definitions.")
              ("libxml2"         ,libxml2)
              ("pango"           ,pango)
              ("potrace"         ,potrace)
-             ("python"          ,python-wrapper)
+             ;; FIXME: We use Python 2 here because there is a bug in Python
+             ;; 3.7 that is triggered when Py_Main is called after Py_Init, as
+             ;; is done by fontforge.  This will be fixed in Python 3.7.1.
+             ("python"          ,python-2)
              ("zlib"            ,zlib)))
    (arguments
     '(#:phases