write_open_telemetry plugin: Wrap headers with `extern "C"`.

This is required for linking correctly.

diff --git a/src/write_open_telemetry.cc b/src/write_open_telemetry.cc
index c45f82d9446cb97d4ab70238db013b9084dc5525..f26f37af1c8e7e91af8621016e2843cd8a5588cb 100644 (file)
--- a/src/write_open_telemetry.cc
+++ b/src/write_open_telemetry.cc
@@ -35,6 +35,7 @@
  * </Plugin>
  */
 
+extern "C" {
 #include "collectd.h"
 
 #include "plugin.h"
@@ -46,6 +47,7 @@
 #include "utils_complain.h"
 
 #include <netdb.h>
+}
 
 #ifndef OT_DEFAULT_HOST
 #define OT_DEFAULT_HOST "localhost"