[Rpm-maint] [rpm-software-management/rpm] Crash with libgcrypt enabled (#968)

[Ross Burton]

Looks like this patch solves the problem for me:

```
diff --git a/rpmio/digest_libgcrypt.c b/rpmio/digest_libgcrypt.c
index b31fda569..3ec2082cf 100644
--- a/rpmio/digest_libgcrypt.c
+++ b/rpmio/digest_libgcrypt.c
@@ -19,8 +19,10 @@ struct DIGEST_CTX_s {
 
 /****************************  init   ************************************/
 
+GCRY_THREAD_OPTION_PTHREAD_IMPL;
+
 int rpmInitCrypto(void) {
-    return 0;
+    return gcry_err_code_to_errno(gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread));
 }
 
 int rpmFreeCrypto(void) {
```

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