nodejs: fix build of host-nodejs

In commit 89fae0d0 ("nodejs: Add
dependency on zlib"), Paul added a dependency of host-nodejs on
host-zlib. When host-zlib is built, the host variant of zlib is
installed in $(HOST_DIR)/usr/lib. However, even though
-L$(HOST_DIR)/usr/lib is passed to the LDFLAGS of host-nodejs
configure script, those LDFLAGS are not re-used at build and install
time. This is because nodejs does not use the autotools and its
configure script does not "save" the environment variables such as
LDFLAGS. This is causing build failures such as:

  http://autobuild.buildroot.org/results/802/802134ceb92d82d2d4ef6a81c67ad1c98696663a/



due to the fact that the host zlib cannot be found.

This commit fixes that by passing $(HOST_CONFIGURE_OPTS) explicitly at
both build time and install time of host-nodejs. This approach was
already used for the target variant of nodejs.

Cc: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>