valgrind: add valgrind suppression for Fedora 22

Fixes for example valgrind tests for ./libnm/tests/test-nm-client:

    ==25772== Conditional jump or move depends on uninitialised value(s)
    ==25772==    at 0x40198D8: index (strchr.S:106)
    ==25772==    by 0x400777C: expand_dynamic_string_token (dl-load.c:369)
    ==25772==    by 0x400777C: fillin_rpath (dl-load.c:439)
    ==25772==    by 0x4007FCF: _dl_init_paths (dl-load.c:816)
    ==25772==    by 0x4002F38: dl_main (rtld.c:1194)
    ==25772==    by 0x401750F: _dl_sysdep_start (dl-sysdep.c:249)
    ==25772==    by 0x4004C20: _dl_start_final (rtld.c:306)
    ==25772==    by 0x4004C20: _dl_start (rtld.c:412)
    ==25772==    by 0x4000C97: ??? (in /usr/lib64/ld-2.21.so)
    ==25772==    by 0x1: ???
    ==25772==    by 0xFFEFFF6B2: ???
    ==25772==    by 0xFFEFFF6EF: ???
    ==25772==
    {
       <insert_a_suppression_name_here>
       Memcheck:Cond
       fun:index
       fun:expand_dynamic_string_token
       fun:fillin_rpath
       fun:_dl_init_paths
       fun:dl_main
       fun:_dl_sysdep_start
       fun:_dl_start_final
       fun:_dl_start
       obj:/usr/lib64/ld-2.21.so
       obj:*
       obj:*
       obj:*
    }

1 files changed, 14 insertions, 0 deletions

diff --git a/valgrind.suppressions b/valgrind.suppressions
index 1368a6041f..7686c225e2 100644
--- a/valgrind.suppressions
+++ b/valgrind.suppressions
@@ -108,6 +108,20 @@
    obj:/*/ld-*.so
 }
 {
+   # added on Fedora 22
+   _dl_expand_dynamic_string_token
+   Memcheck:Cond
+   fun:index
+   fun:expand_dynamic_string_token
+   ...
+   fun:dl_main
+   fun:_dl_sysdep_start
+   fun:_dl_start_final
+   fun:_dl_start
+   obj:/*/ld-*.so
+   ...
+}
+{
     all_gobject_init_ctor
     Memcheck:Leak
     ...