Rename Emacs-specific INFINITY constants
Although these constants were not erroneous, as they were used only in modules that did not include <math.h>, it's less confusing to names that cannot be confused with the now-standard INFINITY macro. * src/dispextern.h (SCROLL_INFINITY): New constant. * src/dispnew.c, src/scroll.c (INFINITY): Remove. All uses replaced with SCROLL_INFINITY. * src/process.c (wait_reading_process_output): Rename private constant.
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