contrib/bc: MFC upgrade from version 7.02 to 7.1.0

This update fixes a few bugs:

• Improper response to double SIGINT with editline.
• Not letting libedit handle terminal size changes.
• A dc crash from improperly handling an error.
• A duplicate check for reference arrays.
• Build failures with GCC 15.

Add extra defines required for bc-7.1.0 to the Makefiles.

The “all.sh” script in version 7.1.0 accepts one less parameter for
selecting the tests to be run.

(cherry picked from commit 4c178fe36e01f84f3c65f6953cbe8dbe5b3fc908)
(cherry picked from commit ab36487a79cd0093d76ec3cdc8eb8c0e114835db)