PING http://codereview.appspot.com/4250047 http://gcc.gnu.org/ml/gcc/2011-01/msg00363.html
this patch moves Valgrind header detection from "valgrind" checking to "misc" and enables the latter whenever the former is enabled. If only "misc" is enabled, then Valgrind header presence is optional. I plan to followup with another patch that adds new configure option --enable-valgrind-annotations that is orthogonal to checking and causes configure to fail if headers are not present. Also I will update wwwdocs once this is accepted to trunk. -- Laurynas
