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/option.h b/src/option.h
index 89cec94..21ee569 100644
--- a/src/option.h
+++ b/src/option.h
@@ -404,7 +404,7 @@
 #ifdef FEAT_COMPL_FUNC
 EXTERN char_u	*p_cfu;		// 'completefunc'
 EXTERN char_u	*p_ofu;		// 'omnifunc'
-EXTERN char_u	*p_thsfu;	// 'thesaurusfunc'
+EXTERN char_u	*p_tsrfu;	// 'thesaurusfunc'
 #endif
 EXTERN int	p_ci;		// 'copyindent'
 #if defined(FEAT_GUI) && defined(MACOS_X)
@@ -1222,7 +1222,7 @@
     , BV_TAGS
     , BV_TC
 #ifdef FEAT_COMPL_FUNC
-    , BV_THSFU
+    , BV_TSRFU
 #endif
     , BV_TS
     , BV_TW