Add ability to redefine VECT_TAB_OFFSET by user (system_stm32f4xx.c) #64
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Unlike HSE_VALUE or HSI_VALUE, VECT_TAB_OFFSET value defined in STM32CubeF4/Drivers/CMSIS/Device/ST/STM32F4xx/Source/Templates/system_stm32f4xx.c can't be redefined by user. Some building scripts (like Platformio ststm32 platform with stm32cube framework script) and libs depends on default system_stm32f4xx.c, so I can't just create my own system_stm32f4xx.c file. This becomes a problem when writing firmware that uses a bootloader, because there's no way to change VECT_TAB_OFFSET without modifying default file.
Suggested small code change adds ability to redefine VECT_TAB_OFFSET by user.