Update missing SPDX licenses
    
    According to Fedora Licensing Guidelines, the License: field should now
    "[enumerate] all licenses covering any code or other material contained
    in the corresponding binary RPM."
    
    Furthermore, "no further analysis as to the 'effective' license should
    be done."
    
    This list of licenses need not include files which "do not end up being
    compiled or otherwise included in the binary package. Common examples of
    this are Autoconf scripts and non-bundled test files."
    
    Fossology lists the following licenses for this package:
    
    1. MIT
    Used throughout. Keep.
    
    2. LicenseRef-scancode-fsf-unlimited-no-warranty
    Makefile.in's and aclocal.m4. Omit.
    
    3. GPL-2.0-only
    Used in tests/. Omit.
    
    4. GPL-2.0-or-later
    Used in m4/ and config/. Omit.
    
    5. GPL-3.0-or-later
    Used in conifg/, m4/, tests/, and the bison-generated parser
    in formats/ctf/metadata/ctf-parser.[ch]. Keep. [See Bison-exception-2.2
    below.]
    
    6. LicenseRef-scancode-autoconf-simple-exception-2.0
    Used in aclocal.m4 and config/. Omit.
    
    7. LicenseRef-scancode-autoconf-macro-exception
    Used only in m4/. Omit.
    
    8. FSFULLR
    Used in m4/ and aclocal.m4. Omit.
    
    9. FSFAP
    Used only in m4/. Omit.
    
    10. LicenseRef-scancode-free-unknown
    In bindings/python/setup.py.in: false identification. Clearly MIT.
    In config/. Omit.
    
    11. Libtool-exception
    Used in config/, m4/, and configure. Omit.
    
    12. LGPL-2.1-only
    From include/babeltrace/list.h. Keep.
    
    13. GPL-1.0-or-later
    From tests/bin/*/*.in: [False identification.] Omit.
    
    14. LicenseRef-scancode-autoconf-simple-exception
    Used only in config/. Omit.
    
    15. FSFUL
    Used in m4/ and configure. Omit.
    
    16. Bison-exception-2.2
    See #5. Keep.
    
    17. BSD-4-Clause-UC
    From */crc32.[ch]. Keep.
    
    18. BSD-2-Clause
    From tests/utils/tap. Omit.
    
    19. X11
    From config/install-sh. Omit.
    
    20. LicenseRef-scancode-public-domain
    From config/install-sh. Omit.
    
    21. LGPL-2.0-only
    From tests/ctf-traces/suceed/*/dummystream. Omit.
    
    AND together all the keeps EXCEPT Bison-exception-2.2/GPL-3.0-or-later.
    OR those. [I am not even going to pretend that this is absolutely
    accurate, but it is closer to the reality of it.]