[Buildroot] Problems with recent zcat changes

[Scott Reese]

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Greetings:

I think that the zcat changes over the last few days have caused some
problems in the makefile.  The newest buildroot fails to build the
skeleton directories correctly.

The Makefile should be changed to reference BR2_ZCAT instead of ZCAT:

107c107
<               $(ZCAT) $(TARGET_SKELETON) | tar -C $(BUILD_DIR) -xf -; \
- ---
>               $(BR2_ZCAT) $(TARGET_SKELETON) | tar -C $(BUILD_DIR) -xf
- -; \

- -Scott
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