postfix: Depend on external libnsl
postfix: Depend on external libnsl

Glibc has dropped libnsl

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>
Signed-off-by: Armin Kuster <525edcd226fb27e7f47fbb319a38fe989c677548@gmail.com>

lgirdk/meta-openembedded,kraj/meta-openembedded,mrchapp/meta-openembedded,lgirdk/meta-openembedded,moto-timo/meta-openembedded,schnitzeltony/meta-openembedded,mrchapp/meta-openembedded,schnitzeltony/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,openembedded/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,mrchapp/meta-openembedded,schnitzeltony/meta-openembedded,mrchapp/meta-openembedded,lgirdk/meta-openembedded,VCTLabs/meta-openembedded,openembedded/meta-openembedded,lgirdk/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,rehsack/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,victronenergy/meta-openembedded,openembedded/meta-openembedded,mrchapp/meta-openembedded,rehsack/meta-openembedded,moto-timo/meta-openembedded,victronenergy/meta-openembedded,lgirdk/meta-openembedded,victronenergy/meta-openembedded,schnitzeltony/meta-openembedded,lgirdk/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,lgirdk/meta-openembedded,rehsack/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,VCTLabs/meta-openembedded,rehsack/meta-openembedded,mrchapp/meta-openembedded,schnitzeltony/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,kraj/meta-openembedded,VCTLabs/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,kraj/meta-openembedded,VCTLabs/meta-openembedded,VCTLabs/meta-openembedded,kraj/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,moto-timo/meta-openembedded,victronenergy/meta-openembedded,openembedded/meta-openembedded,mrchapp/meta-openembedded,victronenergy/meta-openembedded,sigma-embedded/elito-org.openembedded.meta,kraj/meta-openembedded,kraj/meta-openembedded,kraj/meta-openembedded,moto-timo/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,sigma-embedded/elito-org.openembedded.meta