[NUCLEO_F302R8] exporters for gcc_arm and coide

Adds exporter for gcc_arm and coide for the NUCLEO_F302R8.
[NUCLEO_F302R8] exporters for gcc_arm and coide

Adding a missing line in build_release.
Merge pull request #714 from ohagendorf/NUCLEO_F302R8_exporter_2

Tools: NUCLEO_F302R8  - exporters for gcc_arm and coide