package/libopenmpt: bump to version 0.7.10
For release note, see:
https://lib.openmpt.org/libopenmpt/2024/09/22/security-update-0.6.19-releases-0.7.10-0.5.33-0.4.45/
Note: even if the release announcement has "security update" in its title,
it is only applicable to the 0.6.x version series. This version 0.7.10
is NOT impacted by this security fix.
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>