6825175: Remove or disable sanity check on binary plugs

Reviewed-by: xdono

make/common/shared/Sanity.gmk

@@ -502,13 +502,15 @@ endif
 ######################################################
 ifdef OPENJDK
 sane-binary-plugs:
+  ifeq ($(IMPORT_BINARY_PLUGS),true)
 	@if [ ! -d "$(BINARY_PLUGS_PATH)" ]; then \
-	  $(ECHO) "ERROR: Can't locate pre-built libraries. \n" \
+	  $(ECHO) "WARNING: Can't locate pre-built libraries. \n" \
 	    "      Please check your access to \n" \
 	    "          $(BINARY_PLUGS_PATH) \n" \
 	    "      and/or check your value of ALT_BINARY_PLUGS_PATH. \n" \
-	   "" >> $(ERROR_FILE); \
+	   "" >> $(WARNING_FILE); \
 	fi
+  endif
 endif
 
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