Make it possible to select the architecture using a config.xml preference

platforms/android/architecture.gradle

@@ -1 +1,13 @@
+def getArchitecturePreference() {
+  def architecture = 'arm';
+  def file = file("res/xml/config.xml").getText()
+  def xml = new XmlParser(false, false).parseText(xml)
+  
+  xml.preference.each { it ->
+    if(it.attribute("name").toLowerCase == 'buildarchitecture')
+      architecture = it.attribute("value")
+  }
+  
+  return architecture;
+}
 ext.cdvBuildArch = 'arm';