mark SkMD5->SkUUID copy as sane
mark SkMD5->SkUUID copy as sane

GCC gets worried when we do things like memcpy() into non-trivial types
like SkUUID, but this one is pretty clearly fine.  (SkUUID is
non-trivial because of the implicit constructor that zeros it.)  We can
stifle the warning by casting the destination pointer to void*.

Change-Id: I6637964359f5d923fa97c4af2c608e61fdd1f457
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/258448
Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>

HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia