remove external/checkpolicy and external/libsepol

These projects are no longer used and have been replaced by
external/selinux.

Change-Id: If6dc1e9261f397d801ba2376ab60c5dc5b5d86e4
diff --git a/default.xml b/default.xml
index 0b6c164..02c9958 100644
--- a/default.xml
+++ b/default.xml
@@ -73,7 +73,6 @@
   <project path="external/bzip2" name="platform/external/bzip2" groups="pdk" />
   <project path="external/cblas" name="platform/external/cblas" />
   <project path="external/ceres-solver" name="platform/external/ceres-solver" groups="pdk-cw-fs" />
-  <project path="external/checkpolicy" name="platform/external/checkpolicy" groups="pdk" />
   <project path="external/chromium-libpac" name="platform/external/chromium-libpac" />
   <project path="external/chromium-trace" name="platform/external/chromium-trace" groups="pdk" />
   <project path="external/chromium_org" name="platform/external/chromium_org" />
@@ -189,7 +188,6 @@
   <project path="external/libpng" name="platform/external/libpng" groups="pdk" />
   <project path="external/libseccomp-helper" name="platform/external/libseccomp-helper" groups="pdk-cw-fs" />
   <project path="external/libselinux" name="platform/external/libselinux" groups="pdk" />
-  <project path="external/libsepol" name="platform/external/libsepol" groups="pdk" />
   <project path="external/libssh2" name="platform/external/libssh2" groups="pdk-cw-fs" />
   <project path="external/libunwind" name="platform/external/libunwind" groups="pdk" />
   <project path="external/libusb" name="platform/external/libusb" groups="pdk-cw-fs" />