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meta: add note in README about build-fxg3a 

This README is seriously outdated by now...
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@ -105,6 +105,17 @@ The available options are:
% fxsdk build-cg install
```
**"Cross-Building" a fx-9860G II project for fx-CG 50**
Programs written for fx-9860G can also be built to run on the fx-CG series,
provided no low-level function or hardware-specific behavior (like syscalls) is
used by the program.
```
% fxsdk build-fxg3a
% fxsdk build-fxg3a install
```
## Using in CMake-based add-ins
Find the `Gint` module and link against `Gint::Gint`. gint declares the include
@ -121,10 +132,16 @@ target_link_libraries(<target_name> Gint::Gint)
Projects created with the fxSDK link with gint out-of-the-box. If you're not
using the fxSDK, you will need to:
* Build with `-ffreestanding -fstrict-volatile-bitfields`;
* Build with `-ffreestanding -fstrict-volatile-bitfields` and either
`-DFX9860G` or `-DFXGC50`;
* Link with `-T fx9860g.ld -lgint-fx -lopenlibm -lc` on fx-9860G;
* Link with `-T fxcg50.ld -lgint-cg -lopenlibm -lc` on fx-CG 50.
To manually build the fx-CG executable for an fx-9860G program, mix as follows:
* Use platform flags `-DFXCG50 -DFX9860G_G3A`;
* Link with `-T fxcg50.ld -lgint-fxg3a -lopenlibm -lc`.
If you don't have a standard library such as
[Memallox's port of newlib](/PlaneteCasio/libc), you also need `-nostdlib`. I
typically use `-m3 -mb` or `-m4-nofpu -mb` to specify the platform, but that