Troubles with macosx bundle distribution and environ global

[gradha]

A binary I had working on MacOSX 10.8 fails to load on 10.7 and previous due to the global environ variable being accessed directly. The problem was already raised and fixed long ago in #17 by patching the address of the variable with a call to _NSGetEnviron.

However, during commit 53de466 the fix was disabled through the use of defined(createNimRtl) or defined(useNimRtl) guards.

When I try to compile my project with -d:createNimRtl I get:

lib/system/inclrtl.nim(24, 11) Error: nimrtl must be built as a library!

When I try to compile my project with -d:useNimRtl I get:

Error: system module needs 'reprAny'

It is not clear to me how is one to reach the correct code for macosx, or why it needed guards in first place. Is removing guards ok to fix this or should compilation with any of those defines be made to work again?

[zielmicha]

Note: Recently osproc also started using environ directly, so it will also probably crash.

[Araq]

Well can you please make an PR that fixes it?