Bug 419503 - Dirty working tree: about.mappings

Signed-off-by: Thanh Ha <thanh.ha@eclipse.org>

org.eclipse.jdt/about.mappings

diff --git a/org.eclipse.jdt/about.mappings b/org.eclipse.jdt/about.mappings
index bddaab4..515397a 100644
--- a/org.eclipse.jdt/about.mappings
+++ b/org.eclipse.jdt/about.mappings
@@ -3,4 +3,4 @@
 # java.io.Properties file (ISO 8859-1 with "\" escapes)
 # This file does not need to be translated.
 
-0=@build@
\ No newline at end of file
+0=${buildId}