Fix failues of LSB python-runtime tests.
test_largefile: add "ac_cv_sizeof_off_t=8" option explicitly into configure options in order to enable "LFS".
test_codecs, test_re, test_unicode: "--with-wctype-functions" will cause these tests failed, so remove it for LSB.
test_builtin, test_getargs: "sitecustomize.py" cause default encoding changed from "ascii" into "utf8" and it will cause these tests failed, so remove this file for LSB.
