Don't grep for Ddoc warnings

Author: wilzbach

posix.mak

@@ -589,7 +589,7 @@ style_lint: dscanner $(LIB)
 	done
 
 	@echo "Check that Ddoc runs without errors"
-	$(DMD) $(DFLAGS) -defaultlib= -debuglib= $(LIB) -w -D -Df/dev/null -main -c -o- $$(find etc std -type f -name '*.d') 2>&1 | grep -v "Deprecation:"; test $$? -eq 1
+	$(DMD) $(DFLAGS) -defaultlib= -debuglib= $(LIB) -w -D -Df/dev/null -main -c -o- $$(find etc std -type f -name '*.d') 2>&1
 
 ################################################################################
 # Check for missing imports in public unittest examples.