[riot-notifications] [RIOT-OS/RIOT] cpu/stm32/vendor: use submake to fetch CMSIS headers (#15367)

Leandro Lanzieri notifications at github.com
Tue Nov 3 13:39:37 CET 2020

### Contribution description
Similarly to #14858, this adds the `+` indicator and uses `MAKE` to call the submake process. This gets rid of the warning when not doing so, by allowing access to the jobserver:
make -C /home/leandro/Work/RIOT/cpu/stm32/include/vendor
Building application "hello-world" for "nucleo-g070rb" with MCU "stm32".

make[1]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.
make[1]: Entering directory '/home/leandro/Work/RIOT/cpu/stm32/include/vendor'

### Testing procedure
- Green CI

### Issues/PRs references
You can view, comment on, or merge this pull request online at:


-- Commit Summary --

  * cpu/stm32/vendor: use submake to fetch CMSIS headers

-- File Changes --

    M cpu/stm32/Makefile.include (2)

-- Patch Links --


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