cmakefile: add host & target bit wide check

增加编译主机和编译对象的Bit检测
效果如下
```bash
$ ./build Debug
Linux_Debug
-- Host   OS : [Linux 64bit].
-- Target OS : [Linux 64bit].
-- Host's and Target's bitwide are same? : [true].
-- Configuring done
-- Generating done
-- Build files have been written to: /opt/fibjs/zalemwoo-fibjs/vender/out/Linux_Debug

$ ./build Release
Linux_Release
-- Host   OS : [Linux 64bit].
-- Target OS : [Linux 64bit].
-- Host's and Target's bitwide are same? : [true].
-- Configuring done
-- Generating done
-- Build files have been written to: /opt/fibjs/zalemwoo-fibjs/vender/out/Linux_Release

$ ./build Debug32
Linux_Debug32
-- Host   OS : [Linux 64bit].
-- Target OS : [Linux 32bit].
-- Host's and Target's bitwide are same? : [false].
-- Configuring done
-- Generating done

$ ./build Release32
Linux_Release32
-- Host   OS : [Linux 64bit].
-- Target OS : [Linux 32bit].
-- Host's and Target's bitwide are same? : [false].
-- Configuring done
-- Generating done
```
请Review并确认可否合并，谢谢~