Bug#1126933: libgemmlowp-dev is wrongly marked Multi-Arch: foreign

[Helmut Grohne]

Package: libgemmlowp-dev
Version: 0.0~git20181112.18e4cc0-1
Severity: important
User: debian-cross at lists.debian.org
Usertags: ftcbfs
Control: affects -1 + src:tensorflow

libgemmlowp-dev looks like a header-only library, but is not exactly. It
also contains a static library and a bunch of cmake files on
architecture-dependent paths. Therefore, a cross build of tensorflow is
unable to locate gemmlowp. Please remove the erroneous foreign marking
or ensure that no files are installed to architecture-dependent paths.

Helmut