Add support for the GNU Bison option -H

[piotrsiupa]

SCons doesn't recognize the option -H.
It should update the list of output files when the option is encountered. The option -H is the same as --header or --defines which are currently supported. (Well, kinda. See: #4326)
(https://www.gnu.org/software/bison/manual/bison.html#Output-Files)

• Link to SCons Users thread discussing your issue. - https://discord.com/channels/571796279483564041/571796280146133047/1087434623476301836
• Version of SCons - v4.5.1.49578b34582d9e92dac7d713a8e58599ae35aa63
• Version of Python - 3.10.6
• Which python distribution if applicable (python.org, cygwin, anaconda, macports, brew,etc) - the one from Ubuntu repository
• How you installed SCons - through pip
• What Platform are you on? (Linux/Windows and which version) - Linux Mint
• How to reproduce your issue? Please include a small self contained reproducer. Likely a SConstruct should do for most issues. - it's below
• How you invoke scons (The command line you're using "scons --flags some_arguments") - scons

targets = CFile('foo.y', YACCFLAGS='-d')
print('Flag `-d` (correct target list):', targets)

targets = CFile('bar.y', YACCFLAGS='-H')
print('Flag `-H` (incorrect target list):', targets)

[mwichmann]

Seems "obvious", but it's a little harder to parse: --header (and its now-obsolete synonym --defines) use an = to indicate there's a following option-argument (filename). -H does not, you have to just concatenate the filename directly with the option (same for -g).