addition of extern "rtlib" for exposing fb's rtlib internals

[nastasa eodor]

coder jeff
explain by an example
thank you

[MrSwiss]

explain by an example

There are two options:
1) read current FB-Documentation (fbarray)
2) download FBC 1.08.DEV and see: "fbc__/inc/fbc-int/array.bi"
where it is used (it exists in 1.07.0/1 too, but not the same version).

[fxm]

See at documentation forum extern "rtlib" by coderJeff.

[nastasa eodor]

thank you, all