Add option to c language driver to skip symbols presence check to build program modules, like Postgresql extensions or similar

[uxtechie]

Hi!

We need to add an option to skip the check of presence of external symbols in C shared libraries used as program's extensions like PostgreSQL to avoid the gcc -z defs option.

Proposed API:
check-symbols | bool | Check symbols presence in package (default=true)

We will make a PR to solve this need.

[uxtechie]

It doesn't work, we need more research. We closed the PR, sorry for the inconvenience :)