ART: Add setenv to Valgrind target suppressions

Setenv is known-leaking when overwriting existing keys. Ignore.

Bug: 29282211
Change-Id: I4af0bf4d33b9e3d8352f7219710882215def09f1
diff --git a/test/valgrind-target-suppressions.txt b/test/valgrind-target-suppressions.txt
index 896850c..7ae6d53 100644
--- a/test/valgrind-target-suppressions.txt
+++ b/test/valgrind-target-suppressions.txt
@@ -40,3 +40,13 @@
    fun:je_tsd_fetch
    fun:je_malloc_tsd_boot0
 }
+
+# Setenv is known-leaking when overwriting mappings. This is triggered by re-initializing
+# ANDROID_DATA. Ignore all setenv leaks.
+{
+   SetenvAndroidDataReinit
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:malloc
+   fun:setenv
+}