Bug#980636: amd64 fails

[Leopold Palomo-Avellaneda <leo@alaxarxa.net>]

I have almost backported to Buster pytorch and I have found the same error, and 
probably it's something related with rules file.

In the rules file, CMake options are configured and there's a line:

ifneq (,$(filter $(DEB_HOST_ARCH),amd64 arm64 ppc64el))
export USE_MKLDNN = ON
else
export USE_MKLDNN = OFF
endif


however, is passed to CMake USE_MKLDNN = ON (at least my CMakeCache says it). 
The question is that replacing:

ifneq (,$(filter $(DEB_HOST_ARCH),amd64 arm64 ppc64el))

by

ifneq ($(DEB_HOST_ARCH),$(filter $(DEB_HOST_ARCH),amd64 arm64 ppc64el))

it solved the issue. I have seen in another places that maybe should be replaced 
also.



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