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It is only available in make 4.0 and later, and not for example in CentOS 7.
Rewrite the logic to use echo and shell redirection, using a single capture
group to avoid having 12 different processes in quick succession each
appending one line to the file.
Fixes: 52dbd6f07c ("tools: generate pkg-config files from make variables")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Wei Liu <wl@xen.org>