xwayland: Add -verbose option as in xfree86

Makes it easier to debug Xwayland problems.

Signed-off-by: Misha Gusarov <dottedmag@dottedmag.net>
4 jobs for xwayland-verbose in 5 minutes and 43 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Docker Image
passed debian-buster #6975587

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  Build And Test
passed autotools #6975588

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passed meson #6975589

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passed meson-noglamor #6975590

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