include: prereq-build.mk: improve gcp check
authorJo-Philipp Wich <jo@mein.io>
Tue, 11 Oct 2016 07:33:18 +0000 (09:33 +0200)
committerJo-Philipp Wich <jo@mein.io>
Tue, 11 Oct 2016 08:07:25 +0000 (10:07 +0200)
Adjust the check for gcp (GNU copy command) to rule out false positives
with "Goffi's CoPier" a python copy command.

Fixes FS#218.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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