cgen: use C99 short fixed array init syntax #20785
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Before this commit, cgen would initialize fixed arrays like this:
```c
Array_fixed_u8_5 buffer = {0, 0, 0, 0, 0};
```
This means that large arrays would generate *a lot* of C code just for
initializing the array, and that significantly increased compilation
times. C99 allows this short initialization syntax (see C99 6.7.8/21):
```c
Array_fixed_u8_2048 buffer = {0}; // array of 2048 zeroes
```
zeozeozeo
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Before this change, cgen would initialize fixed arrays like this:
This means that large arrays would generate a lot of C code just for initializing the array, and that significantly increased compilation times. C99 allows this short initialization syntax (see C99 6.7.8/21):
Size of v.c before this change: 6,35 MB (6 665 526 bytes)
Size of v.c after this change: 6,11 MB (6 411 950 bytes) (-253 kb)