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8e280e2e - xalloc: Add x2realloc function, from gnulib.

xalloc: Add x2realloc function, from gnulib. * gnulib-local/lib/xalloc.h (x2realloc): New declaration, from gnulib/lib/xalloc.h. * gnulib-local/lib/xmalloc.c (x2nrealloc): New function, from gnulib/lib/xalloc.h. (x2realloc): New function, from gnulib/lib/xmalloc.c. * gnulib-local/modules/xalloc (configure.ac): Require AC_C_INLINE.