Bump libultraship: HD texture-pack regression fixes (#6837)

[bassdr]

Advances the libultraship submodule pin to the current port-maintenance tip (c57da1b -> bbb565b). The bumped pin contains upstream libultraship fixes for several open issues, so merging this closes them.

HD texture-pack regressions (#6837):

• fix(fast3d): don't clamp HD textures to an undefined tile region Kenix3/libultraship#1135 - stop clamping HD textures to an undefined tile region (fixes the eye rendering)
• fast3d: reshape RAW block-load texture uploads that arrive as a single line Kenix3/libultraship#1172 - reshape RAW block-load texture uploads that arrive as a single line (fixes the C-button icons)

Texture corruption with ASLR off / non-PIE builds (#6702):

• fast3d: accept in-module low pointers in the SETTIMG guard on non-Windows Kenix3/libultraship#1176 - accept in-module low pointers in the SETTIMG guard on non-Windows (a valid low host pointer, e.g. a static TLUT, was being rejected as an unresolved N64 segment address; provenance-based, correct regardless of ASLR)

Null-audio softlock (#6858):

• Fix NullAudioPlayer::Buffered() returning 0 (audio-thread spin/hang) Kenix3/libultraship#1167 - NullAudioPlayer::Buffered() returned 0, spinning/hanging the audio thread and stalling ocarina songs

For accuracy: #1167 and the buttons/Metal fix #1143 were already in the prior pin; the new fixes this bump adds are the eye-clamp #1135, the block-load reshape #1172, and the SETTIMG guard #1176. Remaining commits in range are routine port-maintenance fixes (#1139, #1170, #1173, #1175).

Possibly also helped but unverified: the Frezzard-with-mods crash #6856 is a fast3d rendering crash (gfx_tri1_handler_f3dex2) on Windows that may stem from a malformed modded texture; #1135/#1172 could cover it, but that needs a re-test on this pin, so it is not auto-closed here.

Fixes #6837.
Fixes #6702.
Fixes #6858.

Build Artifacts

• soh-windows.zip
• soh-mac.zip
• soh-linux.zip