Suppress warnings from ARM's DSP_Lib code that are spamming developers to no benefit.

Addresses #149
Merge pull request #152 from PX4/#149-mathlib-warnings

Suppress warnings from ARM's DSP_Lib code that are spamming developers t...
Showing correct test count also in success case
Merge branch 'master' of github.com:PX4/Firmware into adc_integration