[macros] Prevent linebreak after \br. This would never be desirable, and that linebreak is not subject to widow/club control (since '\\' overrides penalties).

Author: tkoeppe

source/macros.tex

@@ -396,7 +396,7 @@
  \newcommand{\bnfindentfirst}{\BnfIndent}
  \newcommand{\bnfindentinc}{\BnfInc}
  \newcommand{\bnfindentrest}{\BnfRest}
- \newcommand{\br}{\hfill\\}
+ \newcommand{\br}{\hfill\\*}
  \widowpenalties 1 10000
  \frenchspacing
  }