c: add dht_version()

c/opendht.cpp

@@ -32,6 +32,11 @@ extern "C" {
 
 #include <errno.h>
 
+const char* dht_version()
+{
+    return dht::version();
+}
+
 // dht::InfoHash
 
 inline dht_infohash dht_infohash_to_c(const dht::InfoHash& h) {

c/opendht_c.h

@@ -36,6 +36,8 @@ struct OPENDHT_C_PUBLIC dht_data_view {
 };
 typedef struct dht_data_view dht_data_view;
 
+OPENDHT_C_PUBLIC const char* dht_version();
+
 // dht::Blob
 struct OPENDHT_C_PUBLIC dht_blob;
 typedef struct dht_blob dht_blob;