Make an extra MANDIR variable for easier overriding

Thanks Heinz Wiesinger <HMWiesinger@liwjatan.at> for the report.

Corresponding to flashrom svn r541.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
1 file changed