[bug #65739] Add warnings circular-dep and circular-extra-dep.

[Dmitry Goncharov]

Follow-up Comment #2, bug #65739 (group make):

Here is an example


$ cat makefile
hello: hello
$ make
make: circular hello <- hello dependency dropped
make: Nothing to be done for 'hello'.
$ make --warn=circular-dep:ignore
make: Nothing to be done for 'hello'.
$ make --warn=circular-dep:error 
make: *** circular hello <- hello dependency dropped.  Stop.
$ echo $?
2




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