[Buildroot] ccache problem when compiling with different toolchains in different projects

[Danomi Manchego]

> and then set the CCACHE_COMPILERCHECK to "echo
> $(STAMP_DIR)/toolchain-config-info.md5sum".  Then, the effects of all the
> hidden variables are in some way accounted for without grepping for them in
> the .config.\
>

Sorry, that should have been "cat", not "echo"  - as in 'set the
CCACHE_COMPILERCHECK to "cat $(STAMP_DIR)/toolchain-config-info.md5sum" '.

Danomi -
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