Mark bench suppressions with bug #

bench/valgrind.supp

Index: bench/valgrind.supp
diff --git a/bench/valgrind.supp b/bench/valgrind.supp
index 9114eb93f9b733fdbc15a5c318edd349f47afd42..4b8fd63a2361e1ccfb23dd3f6126d5d15445ac28 100644
--- a/bench/valgrind.supp
+++ b/bench/valgrind.supp
@@ -17,7 +17,7 @@
    fun:FcConfigFileExists
 }
 {
-   SkipZeroes_arrow.png_writes_zeroes
+   SkipZeroes_arrow.png_skip_zeroes http://skbug.com/2452
    Memcheck:Cond
    fun:inflateReset2
    fun:inflateInit2_
@@ -33,7 +33,7 @@
    fun:main
 }
 {
-   SkipZeroes_arrow.png_writes_zeroes Release
+   SkipZeroes_arrow.png_skip_zeroes Release http://skbug.com/2452
    Memcheck:Cond
    fun:inflateReset2
    fun:inflateInit2_
@@ -46,7 +46,6 @@
    fun:_Z9tool_mainiPPc
    fun:(below main)
 }
-
 {
    shadermask_LCD_80
    Memcheck:Cond