Function hasExternalLinkage

hasExternalLinkage($class): $class is
    | AUTO
    | NONE
    | PRIVATE_EXTERN
    | REGISTER
Checks if a storage class has external linkage
Parameters
- $class: StorageClass
  The storage class to check
Returns $class is
    | AUTO
    | NONE
    | PRIVATE_EXTERN
    | REGISTER
Returns true if the class has external linkage, otherwise returns false
- Defined in utils/utils.ts:47