muon complains about the type used for the default value. As it a
boolean type use a boolean as value instead of a string value.
Signed-off-by: Daniel Wagner <dwagner@suse.de>
option('htmldir', type : 'string', value : '', description : 'directory for HTML documentation')
option('docs', type : 'combo', choices : ['false', 'html', 'man', 'all'], description : 'install documentation')
-option('docs-build', type : 'boolean', value : 'false', description : 'build documentation')
+option('docs-build', type : 'boolean', value : false, description : 'build documentation')