[PATCH] Make VPATH build work

[Yang Gu <yang.gu@intel.com>]

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Sometimes, you may need to distinguish the source tree and the build tree, when
you want to keep the source tree uncluttered, or you need to build the source
with several different configurations, or even your source tree is read only.
This feature is called VPATH build and the patch is to make this work.
A typical example is as below (Note that the "build" directory can be any name
and in any place):
> cd ofono && mkdir build && cd build
> ../configure XXX
> make
Then everything you got from the make will reside in "build" directory.
---
 Makefile.am |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index eca8eee..bd74fb7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -374,11 +374,11 @@ $(src_ofonod_OBJECTS) $(unit_objects): $(local_headers)
 
 include/ofono/version.h: include/version.h
 	$(AM_V_at)$(MKDIR_P) include/ofono
-	$(AM_V_GEN)$(LN_S) $(abs_top_builddir)/$< $@
+	$(AM_V_GEN)$(LN_S) $(abs_builddir)/$< $@
 
 include/ofono/%.h: include/%.h
 	$(AM_V_at)$(MKDIR_P) include/ofono
-	$(AM_V_GEN)$(LN_S) $(abs_top_srcdir)/$< $@
+	$(AM_V_GEN)$(LN_S) $(abs_builddir)/$< $@
 
 clean-local: include/ofono
 	@$(RM) -r $<
-- 
1.6.3.3