meson: dep_libdecor is disabled without wayland
Fixes the build when wayland is not installed.
src/egl/eglut/meson.build:34:0: ERROR: Unknown variable "dep_libdecor".
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Fixes the build when wayland is not installed.
src/egl/eglut/meson.build:34:0: ERROR: Unknown variable "dep_libdecor".