Fix compiler warning (signed vs. unsigned comparison).
Fix compiler warning (signed vs. unsigned comparison).
Disable rtti for gcc.
Merge pull request #368 from chrta/gcc_disable_rtti

[Exporters] Disable rtti for gcc.
Merge pull request #365 from chrta/fix_signed_unsigned_compare

Fix signed unsigned compare in dsp library
Typos corrected in optparser info strings
[NUCLEO_F411RE] Add target HAL files
[NUCLEO_F411RE] Add target CMSIS files
Merge pull request #369 from bcostm/dev_NUCLEO_F411RE

[NUCLEO_F411RE] Add all target files
Added 'skipped' build list for build.py
Added new NUCLEO boards definitions to general tests
sendBreak() bugix proposed by mbed user 'chrta'
Removed unused code for reset MCU and runnit single test (old way: like in make.py)
Added safer serial.sendBreak() function implementation to handle Linux issues