Bug#923109: qmidiroute FTCBFS: abuses AC_CHECK_FILE

[Helmut Grohne]

Source: qmidiroute
Version: 0.4.0-1
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

qmidiroute fails to cross build from source, because it abuses
AC_CHECK_FILE. The macro is meant for testing file existence on the
installed system. However, qmidiroute uses it for checking header
directories used during build. For the latter, a simple "test -e" is
better. The attached patch implements that and makes qmidiroute cross
buildable. Please consider applying it.

Helmut
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