autoconf/scons: bump libdrm to 2.4.75

We'll be using the drmGetDevice[s]2 API in src/loader with next patch.

v2: Rebase.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> (v1)
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> (v1)
Tested-by: Mike Lothian <mike@fireburn.co.uk>
2 files changed