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14b07598 - Use xalloc module from gnulib.

Use xalloc module from gnulib. * gnulib-local/lib/xalloc.h: Remove file. * gnulib-local/lib/xmalloc.c: Remove file. * gnulib-local/lib/xstrdup.c: Remove file. * gnulib-local/modules/xalloc: Remove file. * gnulib-local/modules/xalloc-die: Remove file. * gnulib-local/Makefile.am (EXTRA_DIST): Remove them. * libtextstyle/lib/misc.c (xmalloc_exit_failure): Remove declaration. (libtextstyle_set_failure_exit_code): Don't set xmalloc_exit_failure.