John Baldwin a6765c4b44 libmd: Only define SHA256_Transform_c when using the ARM64 ifunc.
GCC 9 doesn't define a SHA256_Transform symbol when the stub just wraps
SHA256_Transform_c resulting in an undefined symbol for
_libmd_SHA256_Transform in libmd.so.

Discussed with:	andrew, jrtc27
Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D31945
2021-12-08 14:25:02 -08:00
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