Remove external/xdelta3 and external/syspatch

BUG: 17299918
Change-Id: I080399c35ea62f1e40dca32728a7c9e3ca57795c

default.xml

@@ -247,7 +247,6 @@
   <project path="external/strace" name="platform/external/strace" />
   <project path="external/stressapptest" name="platform/external/stressapptest" />
   <project path="external/svox" name="platform/external/svox" />
-  <project path="external/syspatch" name="platform/external/syspatch" />
   <project path="external/tagsoup" name="platform/external/tagsoup" />
   <project path="external/tcpdump" name="platform/external/tcpdump" />
   <project path="external/timezonepicker-support" name="platform/external/timezonepicker-support" />
@@ -261,7 +260,6 @@
   <project path="external/webp" name="platform/external/webp" />
   <project path="external/webrtc" name="platform/external/webrtc" groups="pdk" />
   <project path="external/wpa_supplicant_8" name="platform/external/wpa_supplicant_8" groups="pdk" />
-  <project path="external/xdelta3" name="platform/external/xdelta3" />
   <project path="external/xmlwriter" name="platform/external/xmlwriter" />
   <project path="external/xmp_toolkit" name="platform/external/xmp_toolkit" />
   <project path="external/yaffs2" name="platform/external/yaffs2" groups="pdk" />