lttoolbox: Python 310, maybe fix

Author: Dave-Allured

textproc/lttoolbox/Portfile

@@ -37,8 +37,7 @@ checksums               rmd160  81acb8547ecebd9a1ca335ae4cd949bd76e8df8c \
 # https://github.com/apertium/lttoolbox/issues/206
 patchfiles-append       patch-ustring_h.diff
 
-python.default_version  313
-python.pep517           no
+python.default_version  310
 
 depends_build-append    path:bin/pkg-config:pkgconfig \
                         port:utfcpp