Fixed Xcode 12 warnings when building xcframeworks.
Fixed Xcode 12 warnings when building xcframeworks.

PiperOrigin-RevId: 365945547

google/j2objc,google/j2objc,mirego/j2objc,mirego/j2objc,mirego/j2objc,mirego/j2objc,groschovskiy/j2objc,mirego/j2objc,groschovskiy/j2objc,groschovskiy/j2objc,groschovskiy/j2objc,google/j2objc,google/j2objc,google/j2objc,mirego/j2objc,groschovskiy/j2objc,google/j2objc,groschovskiy/j2objc