build: Don't use -Werror=aggregate-return
build: Don't use -Werror=aggregate-return

Some APIs (such as libpcp_import, liblvm2app) might use aggregate returns and we
can't do anything about this.

Also, there is nothing wrong with aggregate returns anymore.

Closes #1756
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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