52440: zle.textobjects: Mark variables as const

Because these variables are initialized with as constant string, they should
be marked as *const* to make the compiler running with `-Wwrite-strings`
more happy.

ChangeLog

@@ -1,3 +1,7 @@
+2024-01-28  Oliver Kiddle  <opk@zsh.org>
+
+	* Jörg Sommer: 52440: Src/Zle/textobjects.c: Mark variables as const
+
 2024-01-26  Oliver Kiddle  <opk@zsh.org>
 
 	* 52405, 52502: Src/Modules/pcre.c, Test/V07pcre.ztst:

Src/Zle/textobjects.c

@@ -283,9 +283,9 @@ selectargument(UNUSED(char **args))
     free(linein);
 
     if (IS_THINGY(bindk, selectinshellword)) {
-	ZLE_CHAR_T *match = ZWS("`\'\"");
-	ZLE_CHAR_T *lmatch = ZWS("\'({"), *rmatch = ZWS("\')}");
-	ZLE_CHAR_T *ematch = match, *found;
+	const ZLE_CHAR_T *match = ZWS("`\'\"");
+	const ZLE_CHAR_T *lmatch = ZWS("\'({"), *rmatch = ZWS("\')}");
+	const ZLE_CHAR_T *ematch = match, *found;
 	int start, end = zlecs;
 	/* for 'in' widget, don't include initial blanks ... */
 	while (mark < zlecs && ZC_iblank(zleline[mark]))