erofs-utils: correct --with-lz4 example in README

Option --with-lz4 means LZ4 install directory rather than LZ4 lib
directory. We will meet configuration error due to wrong path if
setting --with-lz4 to /usr/local/lib. Also stay the same with LZ4
help in configure shell script.

Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Gao Xiang <hsiangkao@aol.com>
1 file changed