Ross Burton 5ba4afcffe Use $(MAKE) when recursing ...

Using 'make' directly means that the jobserver environment variables don't get
passed down, so sub-builds for example don't use -j.

This is documented as the wrong thing to do:
https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html#MAKE-Variable

Use $(MAKE) instead, and compile times drastically improve:

  acrn-devicemodel    do_compile   -13.5s   -89.6%      15.0s -> 1.6s

Tracked-On: #2370
Signed-off-by: Ross Burton <ross.burton@intel.com>

2019-01-24 08:22:32 +08:00

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