Set CGO_ENABLED=0 for riscv64

This fails with a symbol error. Error reported upstream
in golang/go#72840

Author: dustymabe

Makefile

@@ -36,9 +36,13 @@ ifeq ($(GOARCH),x86_64)
 else ifeq ($(GOARCH),aarch64)
         GOARCH="arm64"
 endif
+ifeq ($(GOARCH),riscv64)
+	# https://github.com/golang/go/issues/72840
+	CGO_OVERRIDE=CGO_ENABLED=0
+endif
 
 bin/coreos-assembler:
-	cd cmd && go build -mod vendor -o ../$@
+	cd cmd && $(CGO_OVERRIDE) go build -mod vendor -o ../$@
 .PHONY: bin/coreos-assembler
 
 .%.shellchecked: %

mantle/build

@@ -27,6 +27,13 @@ ldflags="-X ${REPO_PATH}/version.Version=${version}"
 host_build() {
     local cmd=$1; shift
     echo "Building $cmd"
+
+    # Disable CGO if on "riscv64"
+	# https://github.com/golang/go/issues/72840
+    local cgo_override="${CGO_ENABLED:-}"
+    [ "${ARCH}" == "riscv64" ] && cgo_override=0
+
+    CGO_ENABLED=${cgo_override} \
     go build \
         -ldflags "${ldflags}" \
         -mod vendor \