tk: extend to nativesdk

From: Mingli Yu <[email protected]>

After enable tk via PACKAGECONFIG for python3,
there comes below error:
Missing or unbuildable dependency chain was: ['buildtools-tarball', 'nativesdk-python3', 'nativesdk-tk']

Extend tk to nativesdk to fix this issue.

---
 meta-oe/recipes-devtools/tcltk/tk_8.6.8.bb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 13dc4d7..10281b2 100644
@@ -73,7 +73,7 @@ FILES_${PN} += "${libdir}/tk*"
 RDEPENDS_${PN} += "tk-lib"
 RDEPENDS_${PN}_class-native = ""
 
-BBCLASSEXTEND = "native"
+BBCLASSEXTEND = "native nativesdk"
 
 # Fix the path in sstate
 SSTATE_SCAN_FILES += "*Config.sh"

2.7.4