raid6: test: Add support for RISC-V

Add RISC-V code to be compiled to allow the userspace raid6test program
to be built and run on RISC-V.

Signed-off-by: Chunyan Zhang <[e-mail]>
Reviewed-by: Alexandre Ghiti <[e-mail]>
Tested-by: Alexandre Ghiti <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Paul Walmsley <[e-mail]>

lib/raid6/test/Makefile

···
         HAS_NEON = yes
 endif
 
+ifeq ($(findstring riscv,$(ARCH)),riscv)
+        CFLAGS += -I../../../arch/riscv/include -DCONFIG_RISCV=1
+        HAS_RVV = yes
+endif
+
 ifeq ($(findstring ppc,$(ARCH)),ppc)
         CFLAGS += -I../../../arch/powerpc/include
         HAS_ALTIVEC := $(shell printf '$(pound)include <altivec.h>\nvector int a;\n' |\
···
                 vpermxor1.o vpermxor2.o vpermxor4.o vpermxor8.o
 else ifeq ($(ARCH),loongarch64)
         OBJS += loongarch_simd.o recov_loongarch_simd.o
+else ifeq ($(HAS_RVV),yes)
+        OBJS   += rvv.o recov_rvv.o
+        CFLAGS += -DCONFIG_RISCV_ISA_V=1
 endif
 
 .c.o: