Multiple tests crashing on sparc64 due to unaligned access (Bus error)

[glaubitz]

Multiple tests crash on sparc64 with unaligned access (Bus error):

The following tests FAILED:
	 19 - igtlPointMessageTest (Bus error)
	 24 - igtlTrajectoryMessageTest (Bus error)
	 35 - igtlPointMessageTestFormatVersion2 (Bus error)
	 41 - igtlTrajectoryMessageTestFormatVersion2 (Bus error)
Errors while running CTest

Full build log available in: https://buildd.debian.org/status/fetch.php?pkg=openigtlink&arch=sparc64&ver=3.0.0-3&stamp=1757500301&raw=0

Access to SPARC machines for testing can be obtained through the GCC Compile Farm: https://gcc.gnu.org/wiki/CompileFarm