AGOS: Fix sound offset table access for StS 2 Mac/Amiga.

This (hopefully) fixes bug #6549: "#6549 AGOS: Simon2 Amiga Datafiles crashes with assertion in Intro".
I don't have any copy of StS 2 Mac/Amiga thus I cannot test this.

This bug was caused by a regression in c82a75df69aa5d8f36eae52deee508ef9a61e49e.
VOYEUR: Another try to get rid of the hidden overloaded functions
VOYEUR: rename audio and video track access functions
GROOVIE: Remove two useless variables
I18N: Update Hungarian translation from patch #1602
I18N: Update Czech translation from patch #1603
I18N: Update translation data file
DOC: Update Czech README from patch #1603
GIT: Ignore gettext messages.mo file
FULLPIPE: Implement sceneHandler18and19_drawRiders()
TONY: Add some missing virtual keywords
Merge pull request #446 from lordhoto/agos-offset-fix

AGOS: Fix sound offset table access for StS 2 Mac/Amiga.
TONY: Fix clang warnings - Courtesy of LordHoto
TONY: Revert 60980e783ef263f3ed5aa708dc3032779d3be923
FULLPIPE: Make angle arithmetics more readable in scene18/19
CGE: Fix obsolete debug message
FULLPIPE: Implement sceneHandler18and19_girlJumpTo()
FULLPIPE: Implement sceneHandler18and19_manStandArmchair()
FULLPIPE: Implement sceneHandler18and19_showBoyJump()
FULLPIPE: Implement sceneHandler18and19_showGirlJump()