Pass _dl_fini function ptr to __uClibc_start_main().
Pass _dl_fini function ptr to __uClibc_start_main().

To actually use it, one must define _DL_DO_FINI_IN_LIBC globally.
That will also break ABI for apps linked with previous version of crtX.S.
They must be relinked with this version to work again.

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