Spruce up ftfont.c memory allocation
* src/ftfont.c (setup_otf_gstring): Avoid O(N**2) behavior when reallocating. (ftfont_shape_by_flt): Prefer xpalloc to xrealloc when reallocating buffers; this simplifies the code. Do not trust mflt_run to leave the output areas unchanged on failure, as this isn’t part of its interface spec.
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