Add external/libdivsufsort in AOSP.

Bug: 24327902
Change-Id: I6c7c7f70055251de33769279d997d84965d6a21e

default.xml

@@ -194,6 +194,7 @@
   <project path="external/libcxx" name="platform/external/libcxx" groups="pdk" />
   <project path="external/libcxxabi" name="platform/external/libcxxabi" groups="pdk" />
   <project path="external/libdaemon" name="platform/external/libdaemon" />
+  <project path="external/libdivsufsort" name="platform/external/libdivsufsort" groups="pdk" />
   <project path="external/libedit" name="platform/external/libedit" groups="pdk-fs" />
   <project path="external/libevent" name="platform/external/libevent" />
   <project path="external/libexif" name="platform/external/libexif" groups="pdk-cw-fs,pdk-fs" />