doc/api: set HAVE_DOT to YES
dot is required in meson.build, so we can hardcoded it here
Fixes: libinput/build/doc/api/libinput.h:4087: warning: ignoring \dot command because HAVE_DOT is not set
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dot is required in meson.build, so we can hardcoded it here
Fixes: libinput/build/doc/api/libinput.h:4087: warning: ignoring \dot command because HAVE_DOT is not set