btrfs-tools: Fix parallel make issue

btrfs-tools was failing occasionally due to version.h being missing. This
fixes the problems, thanks to several people on #yocto for helping out
why my lack of make knowledge of old fashioned suffix rules :)

(From OE-Core rev: 7be8010186889cece97829025d97d94f21c1f2e5)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/btrfs-tools/btrfs-tools/btrfs-progs-fix-parallel-build2.patch

@@ -0,0 +1,27 @@
+btrfs-progs: Fix parallel build
+
+Upstream-Status: Pending
+
+"make btrfs.o" fails unable to find version.h.
+
+This adds version.h as a dependency for all .o files and fixes various parallel 
+build failures.
+
+RP 20/9/2013
+---
+ Makefile |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+Index: git/Makefile
+===================================================================
+--- git.orig/Makefile	2013-09-20 14:45:34.307723221 +0000
++++ git/Makefile	2013-09-20 16:06:45.503611030 +0000
+@@ -76,7 +76,7 @@
+ 	check = true
+ endif
+ 
+-.c.o:
++%.o: %.c version.h
+ 	$(Q)$(check) $<
+ 	@echo "    [CC]     $@"
+ 	$(Q)$(CC) $(DEPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c $<

meta/recipes-devtools/btrfs-tools/btrfs-tools_git.bb

@@ -21,6 +21,7 @@ PV = "0.20+git${SRCPV}"
 
 SRC_URI += "file://weak-defaults.patch"
 SRC_URI += "file://btrfs-progs-fix-parallel-build.patch"
+SRC_URI += "file://btrfs-progs-fix-parallel-build2.patch"
 
 do_install () {
 	oe_runmake 'DESTDIR=${D}' install