build: Drop checks and workarounds for older Meson versions

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

docs/reference/meson.build

@@ -47,9 +47,6 @@ gtkdoc_common_scan_args = [
 ]
 
 if get_option('gtk_doc')
-  if not meson.version().version_compare('>=0.52.0')
-    error('Building documentation requires Meson >= 0.52.0.')
-  endif
   # Check we have the minimum gtk-doc version required. Older versions won't
   # generate correct documentation.
   dependency('gtk-doc', version : '>=1.32.1',