Merge pull request #3156 from martin-frbg/omatcopy_d

Move x86_64 DOMATCOPY_RT back to the C implementation

Author: martin-frbg

kernel/x86_64/KERNEL

@@ -491,4 +491,3 @@ SSUMKERNEL = ../arm/sum.c
 DSUMKERNEL = ../arm/sum.c
 
 SOMATCOPY_RT = omatcopy_rt.c
-DOMATCOPY_RT = omatcopy_rt.c