[FYI] {maint} tests: fix spurious failures due to dpkg install-info

[Stefano Lattarini]

* t/install-info-dir.sh: Skip some checks if 'install-info' is the one
from dpkg, not the one from GNU info; the former might try to create
files in '/var/backups/', causing spurious failures like this for any
non-root user:

    install-info(.../install-info-dir.dir/_inst/info/foo.info): \
      creating new section `Dummy utilities'
    cp: cannot create regular file `/var/backups/infodir.bak': \
      Permission denied
    install-info(.../install-info-dir.dir/_inst/info/foo.info): \
      could not backup .../install-info-dir.dir/_inst/info/dir in \
      /var/backups/infodir.bak: No such file or directory

Signed-off-by: Stefano Lattarini <address@hidden>
---
 t/install-info-dir.sh |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/t/install-info-dir.sh b/t/install-info-dir.sh
index d8b32d8..4beb937 100755
--- a/t/install-info-dir.sh
+++ b/t/install-info-dir.sh
@@ -67,7 +67,11 @@ $MAKE info
 test -f foo.info
 
 if install-info --version; then
-  have_installinfo=yes
+  if install-info --version | $EGREP -i '(dpkg|debian) install-info'; then
+    have_installinfo=no
+  else
+    have_installinfo=yes
+  fi
 else
   have_installinfo=no
 fi
-- 
1.7.9.5