added maybe_emergency_malloc.h to Makefile.am
added maybe_emergency_malloc.h to Makefile.am

Because without this reference it isn't packaged by make dist.

xiaoyur347/gperftools,gperftools/gperftools,xiaoyur347/gperftools,chencl/gperftools,chencl/gperftools,acmorrow/gperftools,chencl/gperftools,rzinsly/gperftools,gperftools/gperftools,alk/gperftools,acmorrow/gperftools,rzinsly/gperftools,romange/gperftools,romange/gperftools,acmorrow/gperftools,alk/gperftools,rzinsly/gperftools,acmorrow/gperftools,romange/gperftools,xiaoyur347/gperftools,gperftools/gperftools,romange/gperftools,xiaoyur347/gperftools,gperftools/gperftools,chencl/gperftools,alk/gperftools,rzinsly/gperftools,alk/gperftools