Add qsort benchmark for C.
Add qsort benchmark for C.

sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource,sergev/vak-opensource