libdrm: Update version from 2.4.89 to 2.4.93

[Announcement for 2.4.93][1]:

> Christian König (1):
>       amdgpu: make sure to set CLOEXEC on duplicated FDs
>
> Emil Velikov (10):
>       xf86drm: drmGetDevice2: error out if the fd has unknown subsys
>       xf86drm: introduce drm_device_has_rdev() helper
>       xf86drm: Fold drmDevice processing into process_device() helper
>       xf86drm: Allocate drmDevicePtr's on stack
>       xf86drm: introduce a get_real_pci_path() helper
>       xf86drm: Add drmDevice support for virtio_gpu
>       tests/drmdevices: install alongside other utilities
>       tests/drmdevice: add a couple of printf headers
>       drmdevice: convert the tabbed output into a tree
>       drmdevice: print the correct host1x information
>
> Jan Vesely (3):
>       amdgpu: Take a lock before removing devices from fd_tab hash table.
>       amdgpu/util_hash_table: Add helper function to count the number of entries in hash table
>       amdgpu: Destroy fd_hash table when the last device is removed.
>
> José Roberto de Souza (2):
>       intel: Introducing Whiskey Lake platform
>       intel: Introducing Amber Lake platform
>
> Kevin Strasser (1):
>       xf86drm: Be sure to closedir before return
>
> Marek Olšák (3):
>       amdgpu: don't call add_handle_to_table for KMS BO exports
>       amdgpu: add amdgpu_bo_handle_type_kms_noimport
>       configure.ac: bump version to 2.4.93
>
> Mariusz Ceier (1):
>       xf86drm: Fix error path in drmGetDevice2
>
> Michel Dänzer (2):
>       Always pass O_CLOEXEC when opening DRM file descriptors
>       Revert "amdgpu: don't call add_handle_to_table for KMS BO exports"
>
> Rob Clark (5):
>       freedreno: add user ptr to fd_ringbuffer
>       freedreno: add fd_ringbuffer_new_object()
>       freedreno: small cleanup
>       freedreno: slight reordering
>       freedreno/msm: "stateobj" support

[1]: https://lists.x.org/archives/xorg-announce/2018-August/002911.html

libdrm.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION libdrm-2.4.89-0
+# BEE_VERSION libdrm-2.4.93-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)