utils: Allow overriding the shell interpreter in ‘wrap-program’.

Previously, when creating new wrappers, 'wrap-program' would search
for an interpreter to use in PATH. However, this is incorrect when
cross-compiling. Allow overriding the shell interpreter to use,
via an optional keyword argument #:sh.

In time, when all users of 'wrap-program' have been corrected,
this keyword argument can be made mandatory.

* guix/build/utils.scm (wrap-program): Introduce a #:sh keyword
  argument, defaulting to (which "sh"). Use this keyword argument.

Partially-Fixes: <https://issues.guix.gnu.org/47869>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

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