Makefile: three fixes
I'd better set CROSS_COMPILE in the environment than change my path, so CROSS_COMPILE is conditionally assigned. The revision is better "git describe --dirty" than "git rev-parse". The output is a short beautiful string like "wrpc-v2.0-13-g09a736d5" with an optional "-dirty" trailer, to show we compiled a non-committed change. Finally, to execute commands we dont $(shell) at toplevel, but have them in the build rule. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
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