bcg729: Inherit pkgconfig to have PKG_CHECK_MODULES expand

Make sure pkgconfig-native is staged as otherwise autoconf can not
replace the PKG_CHECK_MODULES variable.
diff --git a/recipes-misc/bcg729/bcg729_git.bb b/recipes-misc/bcg729/bcg729_git.bb
index 2be5942..27b2b75 100644
--- a/recipes-misc/bcg729/bcg729_git.bb
+++ b/recipes-misc/bcg729/bcg729_git.bb
@@ -9,4 +9,4 @@
 
 S = "${WORKDIR}/git"
 
-inherit autotools
+inherit autotools pkgconfig