CheckLeakAutoVar: --check-library accepts <use> functions

[Daniel Marjamäki]

Passing an allocated pointer to a function configured as <use> still gives a --check-library message:

use.cfg:

    <memory>
      <alloc>myalloc</alloc>
      <use>set_data</use>
      <dealloc>myfree</dealloc>
    </memory>
    <function name="myalloc"><noreturn>false</noreturn><arg nr="1"/></function>
    <function name="set_data"><noreturn>false</noreturn><arg nr="1"/></function>

use.c:

    void f(void)
    {
        char *p = myalloc(10);
        set_data(p);
    }

    $ cppcheck --check-library --library=use.cfg use.c
    use.c:5:1: warning: --check-library: Function set_data() should have <use>/<leak-ignore> configuration [checkLibraryUseIgnore]

The cfg reference says <use> exists to silence exactly this message, but CheckLeakAutoVarImpl::configurationInfo() only took <leak-ignore/> into account. It now skips functions that have <use> as well. The leak analysis itself is unchanged.

Test: TestLeakAutoVar::configurationUse; it fails without the change.