patch-meson.build

--- meson.build.orig	2020-04-14 20:19:50 UTC
+++ meson.build
@@ -36,5 +36,9 @@ root_dir = include_directories('.')
 subdir('libaccounts-glib')
 subdir('tools')
 subdir('data')
-subdir('docs')
-subdir('tests')
+if get_option('docs')
+   subdir('docs')
+endif
+if get_option('tests')
+   subdir('tests')
+endif