Ensure make clean is idempotent.

Prior to this, `make clean` would fail if the project was not already fully built, and a second invokation would always fail.
senny970 · Mar 1, 2018 · 5519326 · 5519326
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commit 5519326
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diff --git a/examples/opengl2_example/Makefile b/examples/opengl2_example/Makefile
@@ -61,5 +61,5 @@ $(EXE): $(OBJS)
 	$(CXX) -o $(EXE) $(OBJS) $(CXXFLAGS) $(LIBS)
 
 clean:
-	rm $(EXE) $(OBJS)
+	rm -f $(EXE) $(OBJS)
 
diff --git a/examples/opengl3_example/Makefile b/examples/opengl3_example/Makefile
@@ -62,4 +62,4 @@ $(EXE): $(OBJS)
 	$(CXX) -o $(EXE) $(OBJS) $(CXXFLAGS) $(LIBS)
 
 clean:
-	rm $(EXE) $(OBJS)
+	rm -f $(EXE) $(OBJS)