tcl/tcl-native: Fix building when tclsh isn't on the system
tcl/tcl-native: Fix building when tclsh isn't on the system

We do want to change from using the tclsh we just built when building
for the target but for native we want to make sure it's used.

Acked-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>
Signed-off-by: Tom Rini <4c3d5c8f8c21c27dd329bd585f481113514551fd@mentor.com>

SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,BlackPole/bp-openembedded,BlackPole/bp-openembedded,BlackPole/bp-openembedded,BlackPole/bp-openembedded,SIFTeam/openembedded,BlackPole/bp-openembedded,nx111/openembeded_openpli2.1_nx111,BlackPole/bp-openembedded,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded,SIFTeam/openembedded,nx111/openembeded_openpli2.1_nx111,nx111/openembeded_openpli2.1_nx111,BlackPole/bp-openembedded,nx111/openembeded_openpli2.1_nx111,SIFTeam/openembedded