Set the flags used by the interpreter for dlopen calls.
This is used, for example, when the interpreter loads extension
modules. Among other things, this will enable a lazy resolving of
symbols when importing a module, if called as sys.setdlopenflags(0).
To share symbols across extension modules, call as
sys.setdlopenflags(os.RTLD_GLOBAL). Symbolic names for the flag
modules can be found in the os module (RTLD_xxx constants, e.g.
os.RTLD_LAZY).