why limit compiler to -std=gnu++98 when others use -std=gcc++11

[orgua]

• changeable in the file https://github.com/RedBearLab/nRF51822-Arduino/blob/S130/arduino-1.6.x/hardware/RBL/RBL_nRF51822/platform.txt
• i see that there is a problem with snprintf(), but shouldn't that be fixable?
• i am using your latest release with arduino 1.8.3