Bug 1333826 - Remove a few references from .mk files, r=mshal

MozReview-Commit-ID: E5cDr4OO91C

--HG--
extra : rebase_source : 3480c22581113ceee42e07e933f10447048cec70

config/config.mk

@@ -373,9 +373,6 @@ endif
 #
 # Override defaults
 
-SDK_LIB_DIR = $(DIST)/sdk/lib
-SDK_BIN_DIR = $(DIST)/sdk/bin
-
 DEPENDENCIES	= .md
 
 ifdef MACOSX_DEPLOYMENT_TARGET