Bug#798024: updated patch

[Ghislain Vaillant]

 > I think it should be DEB_HOST_ARCH (also below).

I misread this. Did you mean the patch should have been:

```
# Environment information.
DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)

# Build without Altivec to prevent build failures on ppc64el.
ifeq ($(DEB_HOST_ARCH),ppc64el)
DEB_CFLAGS_MAINT_APPEND += -mno-altivec
endif

```

Which I have seen used elsewhere when searching on c.d.n.

Now it all makes sense. Thanks for pointing me to the right piece of 
documentation for it.

Ghislain