Do these two source file(i.e. include\c_std\cstdlib and include\c_global\cstdlib) serve for different purposes whereas they contain similar content?

[孙世龙 sunshilong]

Hi, list

 These two source files (i.e. include\c_std\cstdlib and
include\c_global\cstdlib) have almost same content.
 What is their own role?
 Do these two source files serve for different purposes whereas they
contain similar content?

Thank you for your attention to this matter.