#41 texi2html fails with perl 5.22

[Orion Poplawski]

texi2html fails with perl 5.22 with:

./texi2html -splitnode -menu ../src/python-xlib.texi
Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at ./texi2html line 1560.

The attached patch fixes.