issue-461: Fix to malloc_extension.h so that it builds with -std=gnu++98
issue-461: Fix to malloc_extension.h so that it builds with -std=gnu++98


eixie/gperftools,jamesgolick/gperftools,jamesgolick/gperftools,jamesgolick/gperftools,eixie/gperftools,eixie/gperftools,jamesgolick/gperftools,eixie/gperftools