Build gperf before gcc


Build gperf before gcc

The ARM image builds build the in-tree gcc in order to build u-boot
and gperf is needed to build gcc, but is no longer installed on archs
that use clang.

Invoking the make targets as separate steps is done to work around
a build failure which is not yet fully understood.

Reviewed by: gjb, imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D1317

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