* Future-proof autoconf's Perl version test.
GHC only works with Perl versions 5.6 and later; however the current test greps in a rather non-future-proof way (explicitly against 5.6 and 5.8). We instead exploit the "v-string" change in 5.6, which displays the version string as "v5.x.y", rather than the earlier format "version 5.xxx_yyy". Hence grepping against "v5" will make it future proof for a while. (At least until Perl 6 is installed as the system perl.)
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