backports: Use #ifndef instead of GLIB_CHECK_VERSION
As Will Thompson pointed out on !37, G_OPTION_ENTRY_NULL is a macro in GLib, so we can test for it with `#ifndef` rather than a version guard. This is a little bit nicer for parent projects that might already have their own backport of it. Signed-off-by:Simon McVittie <smcv@collabora.com>
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