Fix uSubBorrow in func_integer.inl
#1360
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Currently
uSubBorrowis confused. It reports the borrow forx-y(so 1 if x < y, 0 otherwise) but returns the (cyclic if underflow) result of doingy-x.https://registry.khronos.org/OpenGL-Refpages/gl4/html/usubBorrow.xhtml states that
The value borrow is set to 0 if x ≥ y and to 1 otherwise. That and the usual operand order for subtraction indicates that the current implementation is wrong. I simply fix this by making it returnx-ywhenx >= yand2^32 + x - yotherwise