Fix Windows zero-native init path resolution error

[edengilbertus]

Fixes #53.

Cause:
zero-native initialization tries to locate its source files by taking its executable path (an absolute path) and joining it with src/root.zig. It passed this to std.Io.Dir.cwd().openFile(). On macOS and Linux, the underlying POSIX openat allows absolute paths, ignoring the directory file descriptor. However, on Windows, NtCreateFile rejects an absolute path when a parent directory handle (RootDirectory) is provided, causing cwd().openFile to throw an error. This caused hasFrameworkRoot to silently catch the error and return false on Windows.

Fix:
Explicitly use std.Io.Dir.openFileAbsolute if std.fs.path.isAbsolute(root_zig) is true, bypassing the directory handle and ensuring the absolute path is correctly read on Windows.

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