cppzmq: fix -dev RDEPENDS
cppzmq: fix -dev RDEPENDS

Since oe-core 6f28420 PN-dev RRECOMMENDS PN instead of RDEPENDS, so this
recipe RDEPENDS on a non-existent package.

Unset DEV_PKG_DEPENDENCY to remove the automatic dependency on PN from
PN-dev.

Signed-off-by: Ross Burton <cd36ec7a67dfb8d589bc66b85fd0a6cf213f3854@arm.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded