meson: Various config.h related fixes

Various adjustments to make the config.h output between autotools
and meson more similar by testing on Linux and Windows/MSYS2.

Setting things to 1 instead of true and shifting things around is motivated
by reducing the diff between the generated files.

modules/printbackends/meson.build

@@ -98,7 +98,7 @@ if enabled_print_backends.contains('cups')
   if enable_colord != 'no'
     want_colord = enable_colord == 'yes'
     colord_dep = dependency('colord', version: '>= 0.1.9', required: want_colord)
-    cdata.set('HAVE_COLORD', colord_dep.found())
+    cdata.set('HAVE_COLORD', colord_dep.found() ? 1 : false)
   else
     cups_colord_dep = []
   endif