TT#84350 fix make races

On some systems (e.g. Github Travis) make seems to have a problem with
its job control, resulting in a race condition where multiple make
instances try to build the same file at the same time. For most files
this is not a problem, but those auto-generated using an append
operation (>>) the output file can become garbled. Solve this by using
an atomic file creation method.

Change-Id: I1acb2387e2ca6ca30ddc3742143fd910032bfbb0

lib/common.Makefile

@@ -25,14 +25,12 @@ install:
 $(OBJS):	Makefile
 
 $(LIBSRCS):	$(patsubst %,../lib/%,$(LIBSRCS))
-		rm -f "$@"
-		echo '/******** GENERATED FILE ********/' > "$@"
-		cat ../lib/"$@" >> "$@"
+		( echo '/******** GENERATED FILE ********/' && \
+		cat ../lib/"$@" ) > "$@"
 
 $(DAEMONSRCS) $(HASHSRCS):	$(patsubst %,../daemon/%,$(DAEMONSRCS)) $(patsubst %,../daemon/%,$(HASHSRCS))
-		rm -f "$@"
-		echo '/******** GENERATED FILE ********/' > "$@"
-		cat ../daemon/"$@" >> "$@"
+		( echo '/******** GENERATED FILE ********/' && \
+		cat ../daemon/"$@" ) > "$@"
 
 %.8: %.pod
 	pod2man \