test-lib: Fix say_color () not to interpret \a\b\c in the message

[git] / t / t4135 / diff-with quote.diff

--- "postimage".txt.orig        2010-08-18 20:13:31.744002255 -0500
+++ "postimage".txt     2010-08-18 20:13:31.744002255 -0500
@@ -1 +1 @@
-preimage
+postimage