The eglibc image is definitely not needed to make gspca webcam to work.
I'll elaborate tomorrow, but in general there's a recipe you can use to enable gspca support when building the Linux image out of the BSP. Check out github.com/alext-mkrs/meta-alex-galileo.
If you don't feel like building it yourself, check out my package repo at alextgalileo.altervista.org. I can't recall if I already have the gspca kernel module package there or not, but if not I can build one. I'll check it out tomorrow.