Use gmtime_r if available as gmtime is not MT-safe.
Original commit message from CVS:
* configure.ac:
* gst-libs/gst/rtsp/gstrtspconnection.c: (add_date_header):
Use gmtime_r if available as gmtime is not MT-safe.
Fixes bug #511810.
diff --git a/configure.ac b/configure.ac
index 6554c4a..4188b60 100644
--- a/configure.ac
+++ b/configure.ac
@@ -239,7 +239,7 @@
AX_CREATE_STDINT_H
dnl *** checks for functions ***
-AC_CHECK_FUNCS([localtime_r])
+AC_CHECK_FUNCS([localtime_r gmtime_r])
dnl *** checks for types/defines ***
