Apparently I haven't tested this compile mode in a while: I had a
couple of compile errors due to new code not properly #ifdeffed (the
true-colour mode has to be effectively disabled in the palette-based
GTK1 graphics model) and one for an unused static function
(get_monitor_geometry is only used in GTK2 and above, and with -Werror
that means I mustn't even _define_ it in GTK1).
With these changes, I still didn't get a clean compile unless I also
configured CFLAGS=-std=gnu89, due to the GTK1 headers having an
outdated set of ifdefs to figure out the compiler's semantics of
'inline'. (They seem to expect old-style gcc, which inconveniently
treats 'inline' and 'extern inline' more or less the opposite way
round from the version standardised by C99.)
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