zstd: Add a stub <assert.h> for the kernel

The stub header includes <sys/kassert.h>. zstd's xx_hash.h #includes
<assert.h> for the definition of static_assert() when building with
C11 or newer.

Re

zstd: Add a stub <assert.h> for the kernel

The stub header includes <sys/kassert.h>. zstd's xx_hash.h #includes
<assert.h> for the definition of static_assert() when building with
C11 or newer.

Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D43239

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