编译脚本用了这个库libtool，但是xcode的文件目录修改，导致找不到文件
可按照下列步骤操作：
As you are using Xcode 7, the libtool is located in the following path:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool
What you can do here is simply copy it, and then paste it to the error's specified location:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/libtool
You should also paste the file in the following path if you are planing to run the app on a device:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/libtool
if you didn't find the usr/bin just create a folder and call it usr, and another one inside it and call it bin. the paste the libtool inside it.
