[PATCH 1/3] htl: fix compatibility

[gfleury]

This fix 91fb9914d867320d65a2abe284fb623d91ae5efb which break a system
built with an old glibc
---
 htl/Versions | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/htl/Versions b/htl/Versions
index d46490b3..343de800 100644
--- a/htl/Versions
+++ b/htl/Versions
@@ -317,6 +317,10 @@ libc {
 }
 
 libpthread {
+  GLIBC_2.2.6 {
+    __libpthread_version_placeholder;
+  }
+
   GLIBC_2.12 {
     pthread_atfork;
 
-- 
2.52.0