fix libbpf_uapi path typo
fix libbpf_uapi path typo

A typo occured in libbpf_uapi path from src/cc/CMakeLists.txt which
made compat linux uapi headers failed to copy.

Signed-off-by: Caspar Zhang <e1684cb1e6dd75540c0b8a5e3ba322ff3af30c24@linux.alibaba.com>

tuxology/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,tuxology/bcc,iovisor/bcc,tuxology/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,iovisor/bcc,brendangregg/bcc,tuxology/bcc,tuxology/bcc,iovisor/bcc