test-clone: fix globs for Windows

tests: diff -r on Solaris emits "Common subdirectories:" When using the -r option to Solaris diff, any directores that compare identically are mentioned in the output. We don't really care about these directories for the purposes of this test, so ignore them.

tests: work around differing hunk headers between GNU and Solaris diff The hunk headers specifying what lines the hunk apply to differ. They're irrelevant to the test, so just eliminate them from the output.

tests: use egrep with regular expression branches for compatibility GNU grep allows you to use "a\|b" in a regular expression to match either "a" or "b", but at least Solaris grep does not; only egrep allows for that. And egrep considers "a+" to be "a{1,}" instead of an "a" and a literal plus sign, so escape that as well.

parsers: silence warning of implicit integer conversion issued by clang "-Wshorten-64-to-32" is enabled by default on Mac OS X. Because "len" should be represented in 32bit integer, this patch simply cast ssize_t to int.

tests: disable test of buffer overflow in parsers.c if --pure It fails with AttributeError and there's no benefit to make it runnable with pure Python code.