Fix s2sx build

Author: klauspost

s2/cmd/_s2sx/gensfx.sh

@@ -4,17 +4,17 @@ go build -o=s2c ../s2c
 
 rm -rf sfx-exe/ || true
 
-GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
-GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
-GOOS=linux GOARCH=arm go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
-GOOS=linux GOARCH=ppc64le go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
-GOOS=linux GOARCH=mpis64 go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
+GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o ./sfx-exe/linux-amd64 ./_unpack/main.go
+GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -o ./sfx-exe/linux-arm64 ./_unpack/main.go
+GOOS=linux GOARCH=arm go build -ldflags="-s -w" -o ./sfx-exe/linux-arm ./_unpack/main.go
+GOOS=linux GOARCH=ppc64le go build -ldflags="-s -w" -o ./sfx-exe/linux-ppc64le ./_unpack/main.go
+GOOS=linux GOARCH=mips64 go build -ldflags="-s -w" -o ./sfx-exe/linux-mips64 ./_unpack/main.go
 
-GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
-GOOS=darwin GOARCH=arm64 go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
+GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w" -o ./sfx-exe/darwin-amd64 ./_unpack/main.go
+GOOS=darwin GOARCH=arm64 go build -ldflags="-s -w" -o ./sfx-exe/darwin-arm64 ./_unpack/main.go
 
-GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
-GOOS=windows GOARCH=386 go build -ldflags="-s -w" -o ./sfx-exe/$GOOS-$GOARCH ./_unpack/main.go
+GOOS=windows GOARCH=amd64 go build -ldflags="-s -w" -o ./sfx-exe/windows-amd64 ./_unpack/main.go
+GOOS=windows GOARCH=386 go build -ldflags="-s -w" -o ./sfx-exe/windows-386 ./_unpack/main.go
 
 ./s2c -rm -slower sfx-exe/*