Document problem with GCC 4.8.3 and the NXFLAT tools

misc/buildroot/toolchain/nxflat/ldnxflat.c

nuttx/TODO

nuttx/configs/eagle100/README.txt

nuttx/configs/ekk-lm3s9b96/README.txt

nuttx/configs/fire-stm32v2/README.txt

nuttx/configs/hymini-stm32v/README.txt

nuttx/configs/kwikstik-k40/README.txt

nuttx/configs/lincoln60/README.txt

nuttx/configs/lm3s6432-s2e/README.txt

nuttx/configs/lm3s6965-ek/README.txt

nuttx/configs/lm3s8962-ek/README.txt

nuttx/configs/lpc4330-xplorer/README.txt

nuttx/configs/lpcxpresso-lpc1768/README.txt

nuttx/configs/mbed/README.txt

nuttx/configs/nucleus2g/README.txt

nuttx/configs/olimex-lpc1766stk/README.txt

nuttx/configs/sam3u-ek/README.txt

nuttx/configs/shenzhou/README.txt

nuttx/configs/stm3210e-eval/README.txt

nuttx/configs/stm3220g-eval/README.txt