[phobos] Can someone please fix isemail for Linux64?

[Don Clugston]

I don't think this ever compiled successfully on 64 bits (when it was
originally committed, the failure was masked by compiler bugs).

std/net/isemail.d(375): Error: cannot implicitly convert expression
(lastIndexOf(addressLiteral,front(matchesIp),cast(CaseSensitive)1)) of
type long to int
make[1]: *** [generated/linux/debug/64/unittest/std/net/isemail] Error 1