util: add missing extern C
This code is included in c++ code via disk_cache in theory,
in practice it never has been.
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6035>
diff --git a/src/util/build_id.h b/src/util/build_id.h
index 1872ca5..2ff596e 100644
--- a/src/util/build_id.h
+++ b/src/util/build_id.h
@@ -24,6 +24,10 @@
#ifndef BUILD_ID_H
#define BUILD_ID_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
#ifdef HAVE_DL_ITERATE_PHDR
#include <stdint.h>
@@ -41,4 +45,7 @@
#endif
+#ifdef __cplusplus
+}
+#endif
#endif /* BUILD_ID_H */
