Building only libraries on windows fails due to CLEAN_C_FILES empty

This issue was migrated from bug 15662 in our old bug tracker.

Original bug information:

Reporter: Fabian Freyer
Status: RESOLVED FIXED
Product: Wireshark
Component: Build process
OS: Windows 10
Platform: x86-64
Version: 3.0.0

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information