[PATCH] Add a makefile check for misbehaving -Wcomment

[Filipe Cabecinhas]

Hi echristo,

gcc's (4.7 at least) -Wcomment warns on line-comment -> backslash ->
newline -> line-comment, while clang doesn't.
If gcc behaves that way, silence -Wcomment.
cmake already has this.

http://reviews.llvm.org/D5946

Files:
  Makefile.config.in
  Makefile.rules
  autoconf/configure.ac
  configure
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