cmake: build/install webpinfo
cmake: build/install webpinfo

Change-Id: Ia3dd24aec0c985855865f32280de1799d4bb8e9e

PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,webmproject/libwebp,webmproject/libwebp,PKRoma/libwebp,webmproject/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,PKRoma/libwebp