Don't try to compare the ctype functions on values > 127

Our internal replacement functions return 0 for those values.
However, depending on locale, the C RTL functions may return 1.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4219)

test/ctype_internal_test.c

@@ -70,7 +70,7 @@ static int test_ctype_tolower(int n)
 
 int setup_tests(void)
 {
-    ADD_ALL_TESTS(test_ctype_chars, 256);
+    ADD_ALL_TESTS(test_ctype_chars, 128);
     ADD_ALL_TESTS(test_ctype_toupper, OSSL_NELEM(case_change));
     ADD_ALL_TESTS(test_ctype_tolower, OSSL_NELEM(case_change));
     return 1;