llappviewer: gate media version reporting on LL_CEF/LL_VLC, not _M_ARM64

The CEF/Dullahan and libVLC version-reporting blocks were guarded with
'#if !_M_ARM64'. _M_ARM64 is an MSVC-only predefined macro: defined only by
MSVC when targeting ARM64, never by GCC or Clang. The intent (per the
'// !LL_LINUX' comment) was to skip these blocks where the media version
headers are unavailable, but the macro only ever excludes MSVC-on-ARM64. On
Clang/macOS _M_ARM64 is undefined even on Apple Silicon, so the blocks
compiled and failed with:

    fatal error: 'cef/dullahan_version.h' file not found

whenever those headers were not on the include path (a build with
ENABLE_MEDIA_PLUGINS off, or any non-MSVC platform lacking the headers).

Gate the includes and the two version-string blocks on the LL_CEF / LL_VLC
compile definitions emitted by newview/CMakeLists.txt, which track the
actual build configuration. The combined include/usage is split so a
platform that provides one library but not the other is handled correctly.

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