RFR : 8217093: Support extended-length paths in parse_manifest.c on windows

Hello, please review this small adjustment to parse_manifest.c . It adds support for extended - length paths (on Window) . (see https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file#maximu... For extended length paths ) Additionally , some small memory leaks are fixed in find_file . Bug/webrev : https://bugs.openjdk.java.net/browse/JDK-8217093 http://cr.openjdk.java.net/~mbaesken/webrevs/8217093.0/ Best rergards, Matthias