shells/fish: fix the build with Clang-6.0
Clang-6.0 on FreeBSD 12 doesn't define __cpp_lib_make_unique. Patch fish to
key off of the value of __cplusplus instead.
PR: 225456
Reported by: pkg-fallout
Reviewed by: jbeich, dim
Differential Revision: https://reviews.freebsd.org/D14058
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head/shells/fish/files/patch-src_common.h