It was not possible to disable alpha.unix.cstring.OutOfBounds checker's reports
since unix.Malloc checker always implicitly enabled the filter.
Moreover if the checker was disabled from command line (-analyzer-disable-checker ...)
the out of bounds warnings were nevertheless emitted under different
checker names such as unix.cstring.NullArg, or unix.Malloc.
This patch fixes the case sot that Malloc checker only enables implicitly the underlying
modeling of strcpy, memcpy etc. but not the warning messages that would have been
emmitted by alpha.unix.cstring.OutOfBounds