lhash.c: Replace Unicode EN DASH with the ASCII char '-'.

 * addressing", Proc. 6th Conference on Very Large Databases: 212–223
                                                                 ^
The EN DASH ('–') in this line is one UTF-8 character (hex: e2 80 93).
Under some code page setting (e.g. 936), Visual Studio may report C4819
warning: The file contains a character that cannot be represented in the
current code page.

Replace this character with the ASCII char '-' (Hex Code: 2D).

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4691)