avoid introducing duplicate const in release builds

git-svn-id: http://skia.googlecode.com/svn/trunk/include@9945 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/utils/SkRTConf.h b/utils/SkRTConf.h
index c34dafb..ea6e99e 100644
--- a/utils/SkRTConf.h
+++ b/utils/SkRTConf.h
@@ -54,7 +54,7 @@
 #define SK_CONF_DECLARE(confType, varName, confName, defaultValue, description) static SkRTConf<confType> varName(confName, defaultValue, description)
 #define SK_CONF_SET(confname, value) skRTConfRegistry().set(confname, value)
 #else
-#define SK_CONF_DECLARE(confType, varName, confName, defaultValue, description) static const confType varName = defaultValue
+#define SK_CONF_DECLARE(confType, varName, confName, defaultValue, description) static confType varName = defaultValue
 #define SK_CONF_SET(confname, value) (void) confname, (void) value
 #endif