Bug#948146: mathic FTCBFS: abuses AC_CHECK_FILE

[Helmut Grohne]

Source: mathic
Version: 1.0~git20180311-2
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

mathic fails to cross build from source, because it abuses AC_CHECK_FILE
for searching files on the build system while it is meant for checking
files on the host system. When inspecting the build system, please use
plain test -e. Please consider applying the attached patch.

Helmut
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