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Currently the flashrom Makefile tries to detect whether pciutils-devel
is installed, but the test also fails if zlib-devel is missing.

This patch changes the error message accordingly.

Corresponding to flashrom svn r90 and coreboot v2 svn r2553.
Signed-off-by: Ed Swierk <eswierk@arastra.com>
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>