Revert "tests/tls: Disable checks for ALPN on apple platforms"

This is not sufficient to disable the test currently.

This reverts commit 784ab6ce69.

test/modules/misc/tls.c

@@ -201,13 +201,9 @@ int main(void)
     answer = 1;
     val = securepair(&th, &tls, alpnv, &alp);
     assert(val == 0);
-
-    /* SecureTransport, used on apple platforms, does not support ALPN */
-#ifndef __APPLE__
     assert(alp != NULL);
     assert(!strcmp(alp, "bar"));
     free(alp);
-#endif
 
     /* Do some I/O */
     char buf[12];