Update valgrind suppressions

tools/valgrind.supp

Index: tools/valgrind.supp
===================================================================
--- tools/valgrind.supp	(revision 0)
+++ tools/valgrind.supp	(revision 0)
@@ -0,0 +1,28 @@
+# Pass this file to Valgrind with "--suppressions=tests/valgrind.supp"
+
+{
+    FcConfig
+    Memcheck:Addr4
+    fun:FcConfigFileExists
+}
+{
+    Mesa_glsl_parsing
+    Memcheck:Cond
+    fun:_ZN22_mesa_glsl_parse_stateC1EP10gl_contextjPv
+    obj:/usr/lib/x86_64-linux-gnu/dri/libglsl.so
+}
+{
+    lib_png_inflate
+    Memcheck:Cond
+    fun:inflateReset2
+    fun:inflateInit2_
+    fun:png_create_read_struct_2
+    fun:png_create_read_struct
+}
+{
+    RTConfRegistry_leak
+    Memcheck:Leak
+    fun:_Znwm
+    fun:_ZN16SkRTConfRegistry12registerConfEP12SkRTConfBase
+}
+