ldd: Handle executable relocation when setting breakpoint

ldd: Handle executable relocation when setting breakpoint

set_entry_point_break() uses GetModuleInformation to fetch the
address of the exe's entry point.  However, just as with
lpStartAddress from the CREATE_PROCESS_DEBUG_EVENT event, the
returned address is only computed from the PE file header.  It's
not actually the entry point in memory, if the executable is
relocated (ASLR).  See
https://msdn.microsoft.com/en-us/library/windows/desktop/ms684229(v=vs.85).aspx

Convert this to using the info from CREATE_PROCESS_DEBUG_EVENT
combined with the offset from the PE file header's  AddressOfEntryPoint
to deal with relocation.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>