Bug 536884 - Removing header cache should cause ScannerInfo refresh

- don't reset setting in shutdown() method as this clears the
  property prematurely for meson and cmake projects

Change-Id: I2dd2467427d00aeade335319ec2ceec9f6d7168d

core/org.eclipse.cdt.core/src/org/eclipse/cdt/core/build/CBuildConfiguration.java

@@ -1145,9 +1145,6 @@ public abstract class CBuildConfiguration extends PlatformObject
 	public void shutdown() {
 		// TODO persist changes
 		
-		// Bug 536884 - Turn off any manual future scanner refresh
-		toolChain.setProperty(NEED_REFRESH,	"false"); //$NON-NLS-1$
-
 		// Trigger a reindex if anything changed
 		// TODO be more surgical
 		if (infoChanged) {