wpsbuild.pl: Fix FS#12706 - paths for backdrops and icons were not properly constructed.

Change-Id: I90b92241501f61e6b1de5305ff6482a9ddbdf722
diff --git a/android/.classpath b/android/.classpath
index 1b4b1ee..0ca188f 100644
--- a/android/.classpath
+++ b/android/.classpath
@@ -3,5 +3,6 @@
 	<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="src" path="gen"/>
+	<classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
 	<classpathentry kind="output" path="bin/classes"/>
 </classpath>