Test Makefiles don't know how to build static libraries on Windows

[llvmbot]

Bugzilla Link	24527
Version	unspecified
OS	Windows NT
Blocks	#22140
Reporter	LLVM Bugzilla Contributor

Extended Description

Makefile.rules needs to be able to build static libraries on Windows for certain test scenarios. It knows how to do this on non-Windows platforms by using the 'ar' command, but it needs to be taught on Windows how to make a .lib file.

This will allow re-enabling TestBSDArchives.py

[Endilll]

Autoconf support was deprecated and removed in 2016.
Feel free to reopen if you encounter similar issue with CMake.