cbe: revert movement of zig_float_from_repr to before float typedefs

[kcbanner]

The calls to zig_float_from_repr need to come after the float typedefs, otherwise it's a compile error:

zig\lib\zig.h(1780): error C2061: syntax error: identifier 'zig_float_from_repr_f16'
zig\lib\zig.h(1780): error C2059: syntax error: ';'
zig\lib\zig.h(1780): error C2059: syntax error: '<parameter-list>'
zig\lib\zig.h(1781): error C2061: syntax error: identifier 'zig_float_from_repr_f32'
zig\lib\zig.h(1781): error C2059: syntax error: ';'
zig\lib\zig.h(1781): error C2059: syntax error: '<parameter-list>'
zig\lib\zig.h(1782): error C2061: syntax error: identifier 'zig_float_from_repr_f64'
zig\lib\zig.h(1782): error C2059: syntax error: ';'
zig\lib\zig.h(1782): error C2059: syntax error: '<parameter-list>'
zig\lib\zig.h(1783): error C2061: syntax error: identifier 'zig_float_from_repr_f80'
zig\lib\zig.h(1783): error C2059: syntax error: ';'
zig\lib\zig.h(1783): error C2059: syntax error: '<parameter-list>'
zig\lib\zig.h(1784): error C2061: syntax error: identifier 'zig_float_from_repr_f128'
zig\lib\zig.h(1784): error C2059: syntax error: ';'
zig\lib\zig.h(1784): error C2059: syntax error: '<parameter-list>'
zig\lib\zig.h(1785): error C2061: syntax error: identifier 'zig_float_from_repr_c_longdouble'
zig\lib\zig.h(1785): error C2059: syntax error: ';'
zig\lib\zig.h(1785): error C2059: syntax error: '<parameter-list>'

This reverts part of the change in 5bd69c6