[gobject-introspection] tests: remove unused test files

[Dieter Verfaillie <dieterv src gnome org>]

commit d4bd173bbcf400c93c895ba9899abbf1d3165102
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Mon Jan 12 17:20:11 2015 +0100

    tests: remove unused test files
    
    libfoo was moved into libregress in 9fc6eb16e954559d97cdd9a03437c8b1877c2a1d
    libtestinherit was moved into libregress in bb1ac9cf2dc450c5d44b1e39e3162ba06069f4a1
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745636

 tests/scanner/Foo-1.0-expected.gir         | 1417 ----------------------------
 tests/scanner/TestInherit-1.0-expected.gir |  117 ---
 2 files changed, 0 insertions(+), 1534 deletions(-)