Bug#1001124: geomview FTCBFS: AC_TRY_RUN check for popen fails

[Helmut Grohne]

Source: geomview
Version: 1.9.5-3
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

geomview fails to cross build from source, because configure gives up on
testing popen for the flag "rb". The check cannot be made to work for
cross compilation. However, popen is so widely supported now that it we
are much better off assuming that it works during cross compilation and
testing it otherwise. Please consider applying the attached patch.

Helmut
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