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attributes.m4: Drop extra quoting from config.h text in CC_CHECK_ATTRIBUTE

The quotes were preventing an ifelse clause in the message from taking effect.

--- a/m4/attributes.m4

+++ b/m4/attributes.m4

@@ -131,8 +131,7 @@

   AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes],

     [AC_DEFINE(

        AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1,

-         [Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))]

-         )

+       Define this if the compiler supports __attribute__((ifelse([$2], , [$1], [$2]))))

      $4],

     [$5])

 ])