Ignore missing versions on required bundles for Java editor examples

Change the PDE preferences from "Warning" to "Ignore".

Author: fedejeanne

examples/org.eclipse.ui.examples.javaeditor/.settings/org.eclipse.pde.prefs

@@ -16,7 +16,7 @@ compilers.p.internal=1
 compilers.p.missing-packages=0
 compilers.p.missing-version-export-package=2
 compilers.p.missing-version-import-package=2
-compilers.p.missing-version-require-bundle=1
+compilers.p.missing-version-require-bundle=2
 compilers.p.no-required-att=0
 compilers.p.not-externalized-att=1
 compilers.p.unknown-attribute=0