meson: set native tool flag variables
meson: set native tool flag variables

As well as setting CC/CXX, export CFLAGS/CXXFLAGS and so on.

Signed-off-by: Ross Burton <cd36ec7a67dfb8d589bc66b85fd0a6cf213f3854@intel.com>
Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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