Sorry, Cruz is a natural born citizen. Nothing compromised.
The State Department's Foreign Affairs Manual:
"7 FAM 1131.6-2 Eligibility for Presidency
(TL:CON-68; 04-01-1998)
a. It has never been determined definitively by a court whether a person who acquired U.S. citizenship by birth abroad to U.S. citizens is a natural born citizen within the meaning of Article II of the Constitution and, therefore, eligible for the Presidency.
d. ...In any event, the fact that someone is a natural born citizen pursuant to a statute does not necessarily imply that he or she is such a citizen for Constitutional purposes."
It has never even been determined that a person born abroad to TWO U.S. citizen parents is Constitutionally eligible. Cruz was born to only ONE U.S. citizen parent.