Fix fflush(NULL) and tweak _stdio_term() for the unbuffered stdio option.
Fix fflush(NULL) and tweak _stdio_term() for the unbuffered stdio option.

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