dot2tex: fix destroot

* Fixes https://trac.macports.org/ticket/65871
  duplicate files going to bin/

Author: nerdling

python/dot2tex/Portfile

@@ -25,7 +25,7 @@ checksums           rmd160  a7d4388511cd487e3aed41698d28211dacf3f2d2 \
 PortGroup           python 1.0
 
 python.default_version  310
-python.pep517           yes
+python.pep517           no
 
 depends_lib-append  port:py${python.version}-parsing