bug#60829: [PATCH] m4: use AS_IF to avoid ! portability issues

[Karl Berry]

    diff --git a/m4/sanity.m4 b/m4/sanity.m4
    ...
    -if ! test -e conftest.file || grep 'slept: no' conftest.file >/dev/null 
2>&1; then
    +AS_IF([test -e conftest.file || grep 'slept: no' conftest.file >/dev/null 
2>&1],, [dnl

Finally installed this change. (And closing.) Thanks Mike. -k