C Mode: Fix indentation of DEFUN's function's argument list.
Formally, when DEFUNs still used knr argument lists, these were indented by the syntactic context knr-argdecl-intro (5 columns). Since this is no longer the case, we now just use c-basic-offset (2 columns in "gnu" style). * lisp/progmodes/cc-align.el (c-indent-gnu-DEFUN-intro-cont): Modernize the indentation. Amend the doc string accordingly.
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