running ./configure --enable-fakegdi --enable-wingdi enables a dummy wingdi gamma adjustment method

Signed-off-by: Mattias Andrée <maandree@operamail.com>
fake-w32gdi uses randr (very sloopyly)

Signed-off-by: Mattias Andrée <maandree@operamail.com>
Merge branch 'fake-windows' into gamma-reduction
update gamma-w32gdi

Signed-off-by: Mattias Andrée <maandree@operamail.com>