add clang-w64-avx512 build and fix clang-w64-modern build

Author: okuhara

src/NMakefile

@@ -64,7 +64,10 @@ icc-w32:
 	icl $(VC_FLAGS) /GL /arch:IA32 all.c ws2_32.lib /Fe..\bin\wEdax-w32.exe
 
 clang-w64-modern:
-	clang-cl -mcrc $(VC_FLAGS) /D HAS_CPU_64 /arch:AVX2 /D POPCOUNT all.c ws2_32.lib /Fe..\bin\wEdax-w64-modern.exe /link /VERSION:4.5
+	clang-cl -mcrc $(VC_FLAGS) /D HAS_CPU_64 /arch:AVX2 /D POPCOUNT /D LASTFLIP_HIGHCUT all.c ws2_32.lib /Fe..\bin\wEdax-w64-modern.exe /link /VERSION:4.5
+
+clang-w64-avx512:
+	clang-cl -mprefer-vector-width=256 -mcrc $(VC_FLAGS) /D HAS_CPU_64 /arch:AVX512 /D POPCOUNT /D LASTFLIP_HIGHCUT all.c ws2_32.lib /Fe..\bin\wEdax-w64-avx512.exe /link /VERSION:4.5
 
 clang-w64:
 	clang-cl $(VC_FLAGS) /D HAS_CPU_64 all.c ws2_32.lib /Fe..\bin\wEdax-w64.exe /link /VERSION:4.5