test cases: do not pass global option on command line

The test covers overriding an option from the dependency() function.
If the same option is passed on the command line, it overrides the
dependency()'s default_options as well.

Tweak the description of the unittests that uses the same sources.
The tests pass, but I am not sure they should.  For example in
the second test the default_library=both setting in the machine file
should have the same effect as the -D option (machine files have lower
priority than command line, but higher priority than anything in meson.build
files).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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