Add -z,lazy to LDFLAGS

[elezar]

This fixes undefined symbol errors on platforms where -z,lazy may not be the default.

This was inadvertently removed in #333 and replaced with -Wl,--export-dynamic -Wl,--unresolved-symbols=ignore-in-object-files which seems to be equivalent on some systems.

[klueska]

Is it an either/or with --unresolved-symbols=ignore-in-object-files and -z,lazy or is it OK on all platforms to have both?

[elezar]

Is it an either/or with --unresolved-symbols=ignore-in-object-files and -z,lazy or is it OK on all platforms to have both?

I can't make a comment on all platforms. From my testing, it works on Ubuntu, but let me check the documentation.

Update: The ld man pages don't mention any connection between the two options. Note it does also state that -z lazy is the default, but it may be that this option is being affected by some config that is set on Gentoo.