Fix write-region and its subroutines for buffers > 2GB.
src/fileio.c (a_write, e_write): Modify declaration of arguments and local variables to support buffers larger than 2GB. (Fcopy_file): Use EMACS_INT for return value of emacs_read. src/sysdep.c (emacs_write, emacs_read): Use ssize_t for last argument, local variables, and return value. src/lisp.h: Update prototypes of emacs_write and emacs_read. src/sound.c (vox_write): Use ssize_t for return value of emacs_write.
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