Revert "Compile lnx_platform.c on FreeBSD too."
This reverts commit 947d1c7e from !1175 (merged).
lnx_platform.c
doesn't exist in this branch since commit 54681238 from !1009 (merged)
renamed it to shared/drm_platform.c
and added it to the BSD build.
Fixes build failures in CI of:
../hw/xfree86/os-support/meson.build:163:18: ERROR: File linux/lnx_platform.c does not exist.
Edited by Alan Coopersmith