nodejs: fix build failure for multilib

bitbake nodejs
[snip]
sed: can't read /buildarea2/build/tmp/work/core2-64-poky-linux/nodejs/0.12.4-r0/image/usr/lib64/node_modules/npm/bin/npm-cli.js:
No such file or directory
[snip]

The node modules are not binary files. It doesn't make sense to install
them to /usr/lib64.
Use /usr/lib/node_modules instead of /usr/lib64/node_modules even on
multilib.

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>