No, it wasn't in the GOP platform since 1854.
The first mention in a platform was a nod to women's rights:
1872 GOP party platform: “The Republican party is mindful of its obligations to the loyal women of America for their noble devotion to the cause of freedom. Their admission to wider fields of usefulness is viewed with satisfaction, and the honest demand of any class of citizens for additional rights should be treated with respectful consideration.”
I will agree with GOP was the liberal party back then, as we've said so many other times. The parties switched positions, however, the were numerous times the GOP held majorities and in both branches and could have done something more than lip service if they wanted to -- but they didn't.
There was no serious attempt on the part of the GOP to allow women the vote via a Constitutional Amendment in the 19th century.
You know who really got the movement going and actually headed it to finally getting something achieved?
The Progressive Party. The people the GOP despise deeply.