is_numeric: Add defined(X11_t) to checks
Fixes builds of XTS which still builds X11 client side code (unlike libX11 which relies on xcb instead of xtrans now for X11 connections).
Fixes: 0f153064 ("is_numeric: Add TRANS_SERVER to required ifdefs")
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Equinix is shutting down its operations with us on April 30, 2025. They have graciously supported us for almost 5 years, but all good things come to an end. We are expecting to transition to new infrastructure between late March and mid-April. We do not yet have a firm timeline for this, but it will involve (probably multiple) periods of downtime as we move our services whilst also changing them to be faster and more responsive. Any updates will be posted in freedesktop/freedesktop#2011 as it becomes clear, and any downtime will be announced with further broadcast messages.
Fixes builds of XTS which still builds X11 client side code (unlike libX11 which relies on xcb instead of xtrans now for X11 connections).
Fixes: 0f153064 ("is_numeric: Add TRANS_SERVER to required ifdefs")