[PATCH] btrfs-progs: Add version.h dependency to fix parallel builds

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Change the suffix rule to ensure that version.h is 
built before we try to create any .o file.

Reported-by: Roy Li <rongqing.li@xxxxxxxxxxxxx>
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---

I dunno, does this work?  My gnu make is rusty.

diff --git a/Makefile b/Makefile
index 3d715d8..d25054f 100644
--- a/Makefile
+++ b/Makefile
@@ -107,13 +107,13 @@ endif
 %.o.d: %.c
 	$(Q)$(CC) -MM -MG -MF $@ -MT $(@:.o.d=.o) -MT $(@:.o.d=.static.o) -MT $@ $(AM_CFLAGS) $(CFLAGS) $<
 
-.c.o:
+%.o: %.c version.h
 	@$(check_echo) "    [SP]     $<"
 	$(Q)$(check) $(AM_CFLAGS) $(CFLAGS) $<
 	@echo "    [CC]     $@"
 	$(Q)$(CC) $(AM_CFLAGS) $(CFLAGS) -c $<
 
-%.static.o: %.c
+%.static.o: %.c version.h
 	@echo "    [CC]     $@"
 	$(Q)$(CC) $(AM_CFLAGS) $(STATIC_CFLAGS) -c $< -o $@
 
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