Graphics on BangleJS2

I sent you the PR that allows specifically #include <math.h> and enables the string literals.

Edit: It'd probably be good to have some other headers in there, such as cstdint.

-mfloat-abi=name
Specifies which floating-point ABI to use. Permissible values are: ‘soft’, ‘softfp’ and ‘hard’.
Specifying ‘soft’ causes GCC to generate output containing library calls for floating-point operations. ‘softfp’ allows the generation of code using hardware floating-point instructions, but still uses the soft-float calling conventions. ‘hard’ allows generation of floating-point instructions and uses FPU-specific calling conventions.

Looks like changing from soft to softfp is exactly what we want.

Edit2: I tested softfp and the compiler does output floating-point instructions. I have no code to test if the float argument passing works as intended, though.