tools: Count argc after parsing GOption on Windows

tools: Count argc after parsing GOption on Windows

Existing codes rely on modified argc value by g_option_context_parse()
but g_option_context_parse_strv() is used in case of Windows.
Count arguments after the option parsing manually.
Fixing command "gst-inspect-1.0.exe -b"

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4322>