* unexelf.c: Fix some 32-bit integer problems, notably when debugging.
Include <limits.h>, <stdbool.h>, <intprops.h>, <verify.h>. Verify that ElfW (Half) fits in int. (fatal): Use same signature as lisp.h. (UNEXELF_DEBUG): New macro, replacing DEBUG, so that people can configure and build with -DUNEXELF_DEBUG without worrying about other modules that use DEBUG. (DEBUG_LOG) [UNEXELF_DEBUG]: New macro. All debug code that prints possibly-wide integers now uses it instead of plain fprintf. (entry_address): New function, which avoids problems with 32-bit overflow on 64-bit hosts. (OLD_SECTION_H, NEW_SECTION_H, NEW_PROGRAM_H): Use it. (round_up): Don't assume the remainder fits in int. (find_section): Use bool for boolean. Simplify debug code. (unexec): Don't assume file sizes fit in int or size_t. Omit unnecessary trailing newline in 'fatal' format. Use strerror rather than outputting decimal error number. Remove unused code when emacs is not defined; this file relies on Emacs now. Don't assume e_phnum and e_shnum are positive.
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