xuxin19 1768e7868b tools/Unix.mk:change incdir to a Make target
after the CI environment is upgraded to Ubuntu 22 and GNU make is upgraded to 4.3,
`warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.` warning appears.
this because when executing a shell in Make, the new shell created will not inherit the parallel environment of the parent shell(jobserver).

in our case:
```
$ make olddefconfig

this execute into Unix.mk twice,
because it will call make clean_context in its target

olddefconfig:
	$(Q) $(MAKE) clean_context
```
We replace the shell call with the target of the Makefile

Signed-off-by: xuxin19 <xuxin19@xiaomi.com>
2023-12-28 10:56:01 -08:00
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