[riot-notifications] [RIOT] make: limit max system load for buildtests (#3267)

Philipp Rosenkranz notifications at github.com
Sun Jun 28 19:10:48 CEST 2015

Currently, the buidtest target executes ```#(virtual) CPU core + 1``` tasks when started. This number can be reduced by setting the ```NPROC``` env variable. 
However, it may make sense to dynamically increase or decrease this number according to the
average system load. 

This PR allows a user (or a CI system) to set a maximum average system load via the env variable ```MAKE_MAXLOAD``` which will be honored by make. This is especially useful when:
* multiple buildtests are executed on the same machine (otherwise you will end up with a system load near 30...).
* a user wants to ensure that a buildtest running on their dev machine doesn't hog all the CPU resources

Regarding the maximum average load I am not sure. For now I choose ```30```.
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-- Commit Summary --

  * make: limit max system load for buildtests

-- File Changes --

    M Makefile.buildtests (6)

-- Patch Links --


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