Fix Default toolchain name in common build tab.

Change-Id: I5e5ff71556780b05f52a28c9ddcf4537fadeb4f6
diff --git a/launch/org.eclipse.cdt.launch/src/org/eclipse/cdt/launch/ui/corebuild/CommonBuildTab.java b/launch/org.eclipse.cdt.launch/src/org/eclipse/cdt/launch/ui/corebuild/CommonBuildTab.java
index 27e7da3..f0ad2cf 100644
--- a/launch/org.eclipse.cdt.launch/src/org/eclipse/cdt/launch/ui/corebuild/CommonBuildTab.java
+++ b/launch/org.eclipse.cdt.launch/src/org/eclipse/cdt/launch/ui/corebuild/CommonBuildTab.java
@@ -123,7 +123,7 @@
 
 			tcCombo.removeAll();
 			if (toolchains.length > 0) {
-				tcCombo.add(String.format(LaunchMessages.CommonBuildTab_Default, toolchains[0]));
+				tcCombo.add(String.format(LaunchMessages.CommonBuildTab_Default, toolchains[0].getName()));
 			} else {
 				tcCombo.add(LaunchMessages.CommonBuildTab_NotFound);
 			}