Merge pull request #4375 from martin-frbg/issue4352

Retire the GotoBLAS gemv_t kernel still used as fallback on x86_64

Author: martin-frbg

kernel/x86_64/KERNEL

@@ -405,7 +405,7 @@ DGEMVNKERNEL = dgemv_n.S
 endif
 
 ifndef DGEMVTKERNEL
-DGEMVTKERNEL = dgemv_t.S
+DGEMVTKERNEL = dgemv_t_4.c
 endif
 
 ifndef CGEMVNKERNEL