This update for libxmp fixes the following issues:

- Update to release 4.6.3
  * Fix crashes when xmp_set_position/xmp_set_row is used to set a
    negative position/row.
  * Fix hangs when xmp_prev_position is used on the first position
    of a sequence which is preceded by an S3M/IT skip marker.
  * Fix out-of-bounds reads when xmp_next_position is used at the
    end of a 256 position module.
  * Fix hangs when seeking to an end-of-module marker caused by
    these positions getting assigned a non-existent sequence.
  * Fix stack underflow in Pha Packer loader (CVE-2025-47256).
  * Fix broken conversion of ProRunner 2.0 pattern data.
  * xmp_set_tempo_factor no longer alters frame time calculation
    for xmp_get_frame_info. Frame time is now updated to account
    for the new time factor after calling xmp_scan_module.
  * Fix loading XMs with some types of harmless pattern truncation.
  * Fix Digital Tracker 2.03 position jump effect for 4 channel
    DTMs.
  * Fix pattern loop jump interactions with same row pattern
    jump/break: Scream Tracker 3.03b+; Impulse Tracker 1.00 to 1.06
    IT; Impulse Tracker 2.00+ IT/S3M; Modplug Tracker 1.16
    IT/XM/S3M; Imago Orpheus IMF/S3M; Liquid Tracker LIQ/S3M; Poly
    Tracker; Digital Tracker >=2.02 DTM/MOD; Digital Tracker 2.03
    (partial); Digital Tracker 1.9 (partial); Octalyser.
  * Fix the pattern loop effect in Astroidea XMF loader.

- Update to release 4.6.2
  * Fix MED effect 1Fxy (delay and retrigger). The new
    implementation supports both delay and retrigger at the same
    time and repeats.
  * Fix MED effect FF3 (revert change from 4.6.1). The buggy
    version of this effect prior to OctaMED v5 is not currently
    supported.
  * Fix MED3 and MED4 time factor and tempos 1-10.
  * Fix MED4 effect 9xx (set speed).
  * Add support for MED3 and MED4 song files.
  * Handle IT modules with edit history but no MIDI configuration.

- Update to release 4.6.1
  * Add stereo sample loading support for IT, S3M, XM, MED, LIQ,
    and Digital Tracker (partial).
  * Add sample preamplification to filter mixers for high sample
    rates.
  * Add support for Ultra Tracker tempo commands.
  * Load Ultra Tracker comments instead of skipping them.
  * Implement support for Protracker instrument swapping.
  * Implement retrigger effects for MED, OctaMED, and Liquid
    Tracker where only one retrigger occurs. Liquid Tracker (new
    format) and Digital Symphony now allow retrigger values larger
    than 15.
  * Fix loop detection edge cases broken by S3M/IT marker scan
    bugs.
  * Add fix for IT break to module scan.
  * Fix restart position for >64k sample and Digital Tracker MODs.
  * Reset Invert Loop position when a new instrument is
    encountered.
  * MOD: make presence of invert loop override tracker ID guesses.
  * M.K. modules within Amiga limits which use EFx invert loop are
    now IDed as Protracker.
  * Support for loading Digital Tracker 2.03 DTMs (MOD patterns).
  * Support for loading Digital Tracker 1.9 DTMs (VERS/SV19).
  * Allow patterns up to 396 rows in Digital Home Studio DTMs.
  * Support for Digital Tracker 1.9 "MIDI note" transpose.
  * Simulate Digital Tracker effects bugs where possible.
  * A bunch of Liquid Tracker (.liq files) bug fixes
  * Fix out-of-bounds reads in His Master's Noise Mupp instruments.
  * Add compatibility for non-standard Pattern Loop
    implementations: Scream Tracker 3.01b; Scream Tracker 3.03b+;
    Impulse Tracker 1.00; Impulse Tracker 1.04 to 2.09; Modplug
    Tracker 1.16; Digital Tracker >=2.04; Digital Tracker 1.9;
    Octalyser; Imago Orpheus; Liquid Tracker; Poly Tracker. (MOD,
    FT2, and IT 2.10+ were already supported.)
  * S3M: Detect PlayerPRO, Velvet Studio and old MPT versions.