Merge pull request #6700 from haukepetersen/opt_vendorheaders

boards/avsextrem/board_init.c

boards/mbed_lpc1768/system.c

boards/msba2-common/board_common_init.c

boards/msba2-common/drivers/include/sht11-board.h

boards/seeeduino_arch-pro/system.c

cpu/atmega_common/avr-libc-extra/errno.h

cpu/atmega_common/include/sys/time.h

cpu/cc26x0/doc.txt

cpu/cortexm_common/Makefile.include

cpu/cortexm_common/include/vendor/cmsis_armcc.h

cpu/cortexm_common/include/vendor/cmsis_armcc_V6.h

cpu/cortexm_common/include/vendor/cmsis_gcc.h

cpu/cortexm_common/include/vendor/core_cm0.h

cpu/cortexm_common/include/vendor/core_cm0plus.h

cpu/cortexm_common/include/vendor/core_cm3.h

cpu/cortexm_common/include/vendor/core_cm4.h

cpu/cortexm_common/include/vendor/core_cm7.h

cpu/cortexm_common/include/vendor/core_cmFunc.h

cpu/cortexm_common/include/vendor/core_cmInstr.h

cpu/cortexm_common/include/vendor/core_cmSimd.h