Update Android port

Update Android port

* java/org/gnu/emacs/EmacsActivity.java (onCreate):
* java/org/gnu/emacs/EmacsContextMenu.java:
* java/org/gnu/emacs/EmacsDocumentsProvider.java (getMimeType):
* java/org/gnu/emacs/EmacsDrawLine.java (perform):
* java/org/gnu/emacs/EmacsDrawRectangle.java (perform):
* java/org/gnu/emacs/EmacsFillPolygon.java:
* java/org/gnu/emacs/EmacsFontDriver.java:
* java/org/gnu/emacs/EmacsHandleObject.java:
* java/org/gnu/emacs/EmacsInputConnection.java:
* java/org/gnu/emacs/EmacsMultitaskActivity.java
(EmacsMultitaskActivity):
* java/org/gnu/emacs/EmacsNative.java:
* java/org/gnu/emacs/EmacsNoninteractive.java
(EmacsNoninteractive, main):
* java/org/gnu/emacs/EmacsOpenActivity.java (EmacsOpenActivity)
(startEmacsClient):
* java/org/gnu/emacs/EmacsSdk7FontDriver.java:
* java/org/gnu/emacs/EmacsSdk8Clipboard.java:
* java/org/gnu/emacs/EmacsService.java (EmacsService, onCreate):
* java/org/gnu/emacs/EmacsView.java (EmacsView, onLayout):
* java/org/gnu/emacs/EmacsWindow.java (EmacsWindow):
* java/org/gnu/emacs/EmacsWindowAttachmentManager.java
(EmacsWindowAttachmentManager): Remove redundant includes.
Reorganize some functions around, remove duplicate `getLibDir'
functions, and remove unused local variables.