Fix test_client_hello with no-tls1_2_method

The extensions not sent when TLS 1.2 is not used caused the message
length to be 109, which is less than the 127 threshold needed
to activate the F5 workaround.  Add another 20 bytes of dummy ALPN
data do push it over the threshold.

Also, fix the definition of the (unused) local macro indicating
the threshold.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4346)

test/clienthellotest.c

@@ -40,14 +40,15 @@
  */
 #define TEST_ADD_PADDING_AND_PSK                3
 
-#define F5_WORKAROUND_MIN_MSG_LEN   0xff
+#define F5_WORKAROUND_MIN_MSG_LEN   0x7f
 #define F5_WORKAROUND_MAX_MSG_LEN   0x200
 
 static const char *sessionfile = NULL;
 /* Dummy ALPN protocols used to pad out the size of the ClientHello */
 static const char alpn_prots[] =
     "0123456789012345678901234567890123456789012345678901234567890123456789"
-    "0123456789012345678901234567890123456789012345678901234567890123456789";
+    "0123456789012345678901234567890123456789012345678901234567890123456789"
+    "01234567890123456789";
 
 static int test_client_hello(int currtest)
 {