net: fix ifenslave build flags

From: Randy Dunlap <[email protected]>

-I (include path) should be specified for host builds. This one was overlooked somehow. Fixes
https://bugzilla.kernel.org/show_bug.cgi?id=25902

---
 Documentation/networking/Makefile |    2 ++
 1 file changed, 2 insertions(+)

@@ -4,6 +4,8 @@ obj- := dummy.o
 # List of programs to build
 hostprogs-y := ifenslave
 
+HOSTCFLAGS_ifenslave.o += -I$(objtree)/usr/include
+
 # Tell kbuild to always build the programs
 always := $(hostprogs-y)
 

From: Randy Dunlap <[email protected]>
Date: Thu, 10 Feb 2011 16:27:25 -0800

I'll apply this, thanks Randy.