Mark files that make use of POSIX ACLs

Makefile

@@ -3,7 +3,7 @@ CXXFLAGS = -g -std=c++14 -Wall -Wextra -pedantic -static-libstdc++
 
 all: sdn
 %: %.cpp CMakeLists.txt
-	$(CXX) $(CXXFLAGS) $< -o $@ `pkg-config --libs --cflags ncursesw` \
+	$(CXX) $(CXXFLAGS) $< -o $@ `pkg-config --libs --cflags ncursesw` -lacl \
 	`sed -ne 's/^project (\([^ )]*\).*/-DPROJECT_NAME="\1"/p' \
 	-e 's/^set (version \([^ )]*\).*/-DPROJECT_VERSION="\1"/p' CMakeLists.txt`
 clean: