Current Git doesn't build

[Nikos Chantziaras]

GCC 4.4.1:

panelize.c: In function 'do_external_panelize': 

panelize.c:445: warning: ignoring return value of 'chdir', declared with 
attribute warn_unused_result
screen.c:470: warning: initialization makes integer from pointer without 
a cast
screen.c:470: error: initializer element is not computable at load time 

screen.c:470: error: (near initialization for 
'panel_fields[4].use_in_user_format') 

screen.c:472: warning: initialization from incompatible pointer type