Add notes about setvbuf and struct tm extension fields tm_gmtoff and tm_zone.
Add notes about setvbuf and struct tm extension fields tm_gmtoff and tm_zone.

skristiansson/uClibc-or1k,ndmsystems/uClibc,majek/uclibc-vx32,hwoarang/uClibc,czankel/xtensa-uclibc,gittup/uClibc,OpenInkpot-archive/iplinux-uclibc,mephi42/uClibc,kraj/uclibc-ng,brgl/uclibc-ng,ddcc/klee-uclibc-0.9.33.2,ndmsystems/uClibc,hjl-tools/uClibc,hwoarang/uClibc,kraj/uClibc,skristiansson/uClibc-or1k,kraj/uClibc,foss-xtensa/uClibc,ChickenRunjyd/klee-uclibc,groundwater/uClibc,czankel/xtensa-uclibc,klee/klee-uclibc,OpenInkpot-archive/iplinux-uclibc,brgl/uclibc-ng,ffainelli/uClibc,atgreen/uClibc-moxie,waweber/uclibc-clang,brgl/uclibc-ng,OpenInkpot-archive/iplinux-uclibc,ysat0/uClibc,foss-xtensa/uClibc,hjl-tools/uClibc,waweber/uclibc-clang,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,klee/klee-uclibc,gittup/uClibc,ddcc/klee-uclibc-0.9.33.2,majek/uclibc-vx32,groundwater/uClibc,foss-xtensa/uClibc,ddcc/klee-uclibc-0.9.33.2,skristiansson/uClibc-or1k,atgreen/uClibc-moxie,hjl-tools/uClibc,groundwater/uClibc,hwoarang/uClibc,ChickenRunjyd/klee-uclibc,ffainelli/uClibc,ffainelli/uClibc,ndmsystems/uClibc,OpenInkpot-archive/iplinux-uclibc,kraj/uclibc-ng,skristiansson/uClibc-or1k,wbx-github/uclibc-ng,hjl-tools/uClibc,kraj/uClibc,ysat0/uClibc,waweber/uclibc-clang,m-labs/uclibc-lm32,ffainelli/uClibc,czankel/xtensa-uclibc,hwoarang/uClibc,m-labs/uclibc-lm32,kraj/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,wbx-github/uclibc-ng,kraj/uclibc-ng,majek/uclibc-vx32,klee/klee-uclibc,wbx-github/uclibc-ng,m-labs/uclibc-lm32,klee/klee-uclibc,gittup/uClibc,foss-xtensa/uClibc,ffainelli/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uclibc-ng,atgreen/uClibc-moxie,ndmsystems/uClibc,mephi42/uClibc,ysat0/uClibc,gittup/uClibc,ddcc/klee-uclibc-0.9.33.2,majek/uclibc-vx32,ysat0/uClibc,hjl-tools/uClibc,ChickenRunjyd/klee-uclibc,mephi42/uClibc,mephi42/uClibc,groundwater/uClibc,atgreen/uClibc-moxie,groundwater/uClibc,m-labs/uclibc-lm32,ChickenRunjyd/klee-uclibc,wbx-github/uclibc-ng,czankel/xtensa-uclibc,waweber/uclibc-clang,foss-for-synopsys-dwc-arc-processors/uClibc