Bumping manifests a=b2g-bump

b2g/config/emulator-kk/sources.xml

@@ -12,7 +12,7 @@
   <!--original fetch url was https://git.mozilla.org/releases-->
   <remote fetch="https://git.mozilla.org/releases" name="mozillaorg"/>
   <!-- B2G specific things. -->
-  <project name="platform_build" path="build" remote="b2g" revision="276ce45e78b09c4a4ee643646f691d22804754c1">
+  <project name="platform_build" path="build" remote="b2g" revision="999e945b85c578c503ad445c2285940f16aacdae">
     <copyfile dest="Makefile" src="core/root.mk"/>
   </project>
   <project name="gaia" path="gaia" remote="mozillaorg" revision="3350409b239917eee74bc6732da62f1fe383c798"/>