meson-options: Make it possible to call this script from anywhere

Resolve the directory where meson_options.txt is located. This is
helpful for running the script in out-of-tree builds.

v2: Use __file__ (Dylan) and simplify path evaluation

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
1 job for !1870 with meson-allow-true-false-for-autofeatures in 24 seconds (queued for 2 seconds)
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