get fixup target flags
ea - address to get information about
returns: 0 - no fixup at the specified address
otherwise returns fixup flags:
long get_fixup_target_flags(long ea);
#define FIXUPF_REL 0x1 // fixup is relative to the linear address
#define FIXUPF_EXTDEF 0x2 // target is a location (otherwise - segment)
#define FIXUPF_UNUSED 0x4 // fixup is ignored by IDA
#define FIXUPF_CREATED 0x8 // fixup was not present in the input file