Darwin13.supp should include suppression for known deliberate memory leak in setenv(). Patch and discussion per BZ #339755.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14859 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/darwin13.supp b/darwin13.supp
index e049712..1a66857 100644
--- a/darwin13.supp
+++ b/darwin13.supp
@@ -123,6 +123,17 @@
    fun:_st_tzset_basic
 }
 
+# See https://bugs.kde.org/show_bug.cgi?id=188572 about this;  it's
+# unavoidable due to BSD setenv() semantics.
+{
+   macos-__setenv-leak-see-our-bug-188572
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:malloc
+   fun:_owned_ptr_alloc
+   fun:setenv
+}
+
 ############################################
 ## Non-leak errors