We are passing flags to `configure.py` in order to tell the nodejs build
toolchain to use shared libraries. The toolchain seems to mistakenly
also try use shared libraries for host build, but it does not add
respective linker flags (For example `-lz` for zlib). This commit
hardcodes these flags to be always passed to linker by setting linker to
linker + LDFLAGS of shared libraries
Yaksh Bariya
Fredrik Fornwall