msix: use absolute paths for file list entries in map file

The LIST entries are relative to the MSYS root (/). When
makeappx.exe runs, it resolves them relative to the current working
directory instead. Convert them to absolute Windows paths using the
MSYS root so makeappx.exe can find the files.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: Shmueli Englard <senglard@microsoft.com>

Author: shmuelie

msix/release.sh

@@ -191,8 +191,9 @@ echo "\"$(cygpath -aw "$SCRIPT_PATH")/Assets/Square44x44Logo.png\" \"Assets/Squa
 echo "\"$(cygpath -aw "$SCRIPT_PATH")/Assets/Square44x44Logo.scale-200.png\" \"Assets/Square44x44Logo.scale-200.png\"" >>"$MAPFILE" &&
 echo "\"$(cygpath -aw "$SCRIPT_PATH")/Assets/Square44x44Logo.targetsize-24_altform-unplated.png\" \"Assets/Square44x44Logo.targetsize-24_altform-unplated.png\"" >>"$MAPFILE" &&
 echo "\"$(cygpath -aw "$SCRIPT_PATH")/Assets/StoreLogo.png\" \"Assets/StoreLogo.png\"" >>"$MAPFILE" &&
+MSYS_ROOT="$(cygpath -aw /)" &&
 echo "$LIST" |
-sed -e 'y/\//\\/' -e 's/.*/"&" "&"/' >>"$MAPFILE"
+sed -e 'y/\//\\/' -e "s|.*|\"$MSYS_ROOT\\\\&\" \"&\"|" >>"$MAPFILE"
 
 MSYS_NO_PATHCONV=1 "$MAKEAPPX" pack /v /o /f "$(cygpath -aw "$MAPFILE")" /p "$(cygpath -aw "$TARGET")" &&
 echo "Package created at $TARGET"