patch 8.2.3528: 'thesaurus' and 'thesaurusfunc' do not have the same scope

Problem:    'thesaurus' and 'thesaurusfunc' do not have the same scope.
Solution:   Make 'thesaurusfunc' global-local.
diff --git a/src/version.c b/src/version.c
index 3013dfc..b1fc4dc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3528,
+/**/
     3527,
 /**/
     3526,