Convert osmo_bts_sock.cpp to C
There's no real point in using C++ there, and using C++ makes the
compiler fail to use llist_head in multi-bts patches added later due to:
"""
'offsetof' within non-standard-layout type is conditionally-supported
"""
Change-Id: I8965b5cc5a713e64788b5b6aa183d3035341ddbb
diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index fbcb503..798dc3c 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -166,7 +166,7 @@
/* override, requires '-Wl,--wrap=pcu_sock_send' */
int __real_pcu_sock_send(struct msgb *msg);
-int __wrap_pcu_sock_send(struct msgb *msg)
+extern "C" int __wrap_pcu_sock_send(struct msgb *msg)
{
return 0;
}