Add Zopfli-recompress option to zipalign

Zopfli provides compression roughly 5% better than zlib, while remaining
completely compatible with zlib decoders. This patch adds a "-z" option
to zipalign, recompressing all compressed files within the zip archive.

Change-Id: If177ca4b82ec701b7446861b2cfe08c6bd403813
diff --git a/tools/zipalign/Android.mk b/tools/zipalign/Android.mk
index 708c8bf..7986798 100644
--- a/tools/zipalign/Android.mk
+++ b/tools/zipalign/Android.mk
@@ -12,13 +12,15 @@
 	ZipEntry.cpp \
 	ZipFile.cpp
 
-LOCAL_C_INCLUDES += external/zlib
+LOCAL_C_INCLUDES += external/zlib \
+	external/zopfli/src
 
 LOCAL_STATIC_LIBRARIES := \
 	libandroidfw \
 	libutils \
 	libcutils \
-	liblog
+	liblog \
+	libzopfli
 
 ifeq ($(HOST_OS),linux)
 LOCAL_LDLIBS += -lrt