Memory-management cleanup in make-docfile
I compiled it with -fsanitize=address and fixed the leaks it detected. Also, I changed it to prefer signed to unsigned integer types, and to check for integer overflow. * lib-src/make-docfile.c: Include <stddef.h>, <stdint.h>, <intprops.h>, <min-max.h>. (memory_exhausted): New function. (xmalloc, xrealloc): Use it. (xmalloc, xrealloc, scan_file, struct rcsoc_state, write_c_args) (uncompiled, scan_lisp_file): Prefer signed integer types to unsigned. (xstrdup): Remove. All uses removed. (num_globals, num_globals_allocated, write_globals, scan_c_stream): Use ptrdiff_t, not int, for indexes that in theory could exceed INT_MAX. (add_global): Use const to pacify --enable-gcc-warnings. Make a copy here, rather than relying on strdup calls later. (add_global, write_globals, scan_c_stream): Avoid integer overflow when calculating sizes. (write_globals, scan_c_stream, scan_lisp_file): Avoid memory leak. (scan_c_stream): Check for add_global failure.
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