Unreasonable initial dependence

[LPX-E5BD8]

When installing in a brand new environment, it will rely on the go command.

The code is from .gvm/scripts/install, and when the script executes the compile_go method, it requires that the go command has already been installed in the system.

If you use this script on a system where no version of go has been installed, it will not be able to run.

compile_go() {
	display_message " * Compiling..."
	# Test for Windows
	case "$(uname)" in
	*MINGW* | *WIN32* | *CYGWIN*)
		MAKE_SCRIPT=make.bat
		;;
	*)
		MAKE_SCRIPT=make.bash
		;;
	esac
	[ -z "$GOROOT_BOOTSTRAP" ] && export GOROOT_BOOTSTRAP=$(go env GOROOT)         《-- this line
	unset GOARCH && unset GOOS && unset GOPATH && unset GOBIN && unset GOROOT &&
	export GOBIN=$GO_INSTALL_ROOT/bin &&
	export PATH=$GOBIN:$PATH &&
	export GOROOT=$GO_INSTALL_ROOT &&
	if [ ! -f "$GO_INSTALL_ROOT/VERSION" ]; then echo "$GO_NAME" > "$GO_INSTALL_ROOT/VERSION"; fi &&
	#builtin cd $GO_INSTALL_ROOT/src && ./all.bash &> $GVM_ROOT/logs/go-$GO_NAME-compile.log ||
	builtin cd "$GO_INSTALL_ROOT/src" && chmod -f +x $MAKE_SCRIPT && ./$MAKE_SCRIPT &> "$GVM_ROOT/logs/go-$GO_NAME-compile.log" ||
		(rm -rf "$GO_INSTALL_ROOT" && display_fatal "Failed to compile. Check the logs at $GVM_ROOT/logs/go-$GO_NAME-compile.log")
}

It's recommended to check if the go command exists in the environment before installation, and only then use the go env GOROOT command to initialize the GOROOT_BOOTSTRAP variable.