Fix CVE-2026-59679: out-of-bounds read/write in fs_read_glyphs due to
num_chars not being validated against the allocated encoding array size
in fserve.c
(upstream commit 668fea81f40bcb48ec67fb55d0b851049d265290)
Fix CVE-2026-44950: heap buffer overflow in fs_read_glyphs due to a missing
bounds check on cumulative glyph data writes into the allbits buffer
in fserve.c
(upstream commit c2d222bb22c623d8a40f3275077fc7e6617f2c8a)