Exclude samples directories

Bug: 31202928
Test: Manually verified that sample sources are no longer included.
Change-Id: I28b2b4e4fc57c0f6e787c5b840f3cff03ee543e7
diff --git a/build/tools/mk_sources_zip.py b/build/tools/mk_sources_zip.py
index 3220e3a..09cfed1 100755
--- a/build/tools/mk_sources_zip.py
+++ b/build/tools/mk_sources_zip.py
@@ -39,7 +39,7 @@
         self.CNT_NOPKG = 0
         # DIR is the list of directories to scan in TOPDIR.
         self.DIR = "frameworks libcore"
-        self.IGNORE_DIR = [ "hosttests", "tools", "tests" ]
+        self.IGNORE_DIR = [ "hosttests", "tools", "tests", "samples" ]
         # IGNORE is a list of namespaces to ignore. Must be java
         # package definitions (e.g. "com.blah.foo.")
         self.IGNORE = [ "sun.", "libcore.", "dalvik.",