Fix some portability problems with 'inline'.
* dispextern.h (window_box, window_box_height, window_text_bottom_y) (window_box_width, window_box_left, window_box_left_offset) (window_box_right, window_box_right_offset): Declare extern. Otherwise, these inline functions do not conform to C99 and are miscompiled by Microsoft compilers. Reported by Eli Zaretskii in <http://lists.gnu.org/archive/html/emacs-devel/2011-11/msg00084.html>. * intervals.c (adjust_intervals_for_insertion) (adjust_intervals_for_deletion): Now extern, because otherwise the extern inline functions 'offset_intervals' couldn't refer to it. (static_offset_intervals): Remove. (offset_intervals): Rewrite using the old contents of static_offset_intervals. The old version didn't conform to C99 because an extern inline function contained a reference to an identifier with static linkage.
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