added __ text label to stm32f0xx linker script for OS_CRASH_STACKTRACE and alike
added __ text label to stm32f0xx linker script for OS_CRASH_STACKTRACE
and alike

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core