Bug#929037: mathicgb FTCBFS: abuses AC_CHECK_FILE

[Helmut Grohne]

Source: mathicgb
Version: 1.0~git20170606-2
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

mathicgb fails to cross build from source, because it abuses
AC_CHECK_FILE to discover source files on the build machine. The macro
is meant to check for files on the host. Please use simple "test -f"
here. The attached patch makes mathicgb cross buildable. Please consider
applying it.

Helmut
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