Stop building various files we don't need.

Test: treehugger
Change-Id: I3a2334cecbfe37f66f742df62fb9d948419a3244
diff --git a/Android.bp b/Android.bp
index 3f4c114..27f5dae 100644
--- a/Android.bp
+++ b/Android.bp
@@ -21,7 +21,6 @@
         "cups/array.c",
         "cups/auth.c",
         "cups/backchannel.c",
-        "cups/backend.c",
         "cups/debug.c",
         "cups/dest.c",
         "cups/dest-job.c",
@@ -46,16 +45,6 @@
         "cups/md5passwd.c",
         "cups/notify.c",
         "cups/options.c",
-        "cups/ppd.c",
-        "cups/ppd-attr.c",
-        "cups/ppd-cache.c",
-        "cups/ppd-conflicts.c",
-        "cups/ppd-custom.c",
-        "cups/ppd-emit.c",
-        "cups/ppd-localize.c",
-        "cups/ppd-mark.c",
-        "cups/ppd-page.c",
-        "cups/ppd-util.c",
         "cups/pwg-media.c",
         "cups/raster-error.c",
         "cups/raster-stream.c",
@@ -63,7 +52,6 @@
         "cups/request.c",
         "cups/sidechannel.c",
         "cups/snmp.c",
-        "cups/snprintf.c",
         "cups/string.c",
         "cups/tempfile.c",
         "cups/thread.c",