Honor TARGET_NO_RECOVERY flag.

Don't generate recovery.img when calling 'make dist' if
TARGET_NO_RECOVERY is set. The build system passes the flag to the
packaging script which then generates recovery.img conditionally.

Bug: 25329471
Change-Id: Ia7f08943834ee39e781d7e9b5beb1b31d95a73d9
(cherry picked from commit db45efa64764c1de5c007384ab172ad817e1d295)
diff --git a/tools/releasetools/img_from_target_files.py b/tools/releasetools/img_from_target_files.py
index c486992..99c991a 100755
--- a/tools/releasetools/img_from_target_files.py
+++ b/tools/releasetools/img_from_target_files.py
@@ -110,10 +110,12 @@
           "boot.img", "boot.img", OPTIONS.input_tmp, "BOOT")
       if boot_image:
         boot_image.AddToZip(output_zip)
-      recovery_image = common.GetBootableImage(
-          "recovery.img", "recovery.img", OPTIONS.input_tmp, "RECOVERY")
-      if recovery_image:
-        recovery_image.AddToZip(output_zip)
+
+      if OPTIONS.info_dict.get("no_recovery") != "true":
+        recovery_image = common.GetBootableImage(
+            "recovery.img", "recovery.img", OPTIONS.input_tmp, "RECOVERY")
+        if recovery_image:
+          recovery_image.AddToZip(output_zip)
 
       def banner(s):
         print "\n\n++++ " + s + " ++++\n\n"