fully initialze modern gcrypt in MHD_init, only use thread initialization with legacy libgcrypt, update tests accordingly

src/testcurl/https/test_https_get_parallel_threads.c

@@ -123,10 +123,6 @@ test_parallel_clients (void *cls, const char *cipher_suite,
 }
 
 
-
-GCRY_THREAD_OPTION_PTHREAD_IMPL;
-
-
 int
 main (int argc, char *const *argv)
 {
@@ -136,9 +132,6 @@ main (int argc, char *const *argv)
   /* initialize random seed used by curl clients */
   unsigned int iseed = (unsigned int) time (NULL);
 
-
-  gcry_control (GCRYCTL_ENABLE_QUICK_RANDOM, 0);
-  gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
 #ifdef GCRYCTL_INITIALIZATION_FINISHED
   gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
 #endif