Support C99 array declarator syntax involving static and *

[xavierleroy]

E.g. int x[static 10] or int x [*]. Currently, treated like int x[10] and int x[] respectively.

Ref: https://en.cppreference.com/w/c/language/array ; C99 6.7.5.2, C11 6.7.6.2.

Fixes: #531

[monniaux]

Fails line 7:

void foo(int [5]);
void fooc(int x[const 5]);
void foos(int x[static 5]);
void foov(int x[volatile 5]);
void foor(int x[restrict 5]);
void fooc(int [const 5]);
void foos(int [static 5]);
void foov(int [volatile 5]);
void foor(int [restrict 5]);
void fooc(int (* const x));
void foos(int *x);
void foov(int * volatile x);
void foor(int * restrict x);
void fooc(int x[volatile 5])

[xavierleroy]

The parsers needed updating in two places, "direct declarators" and "direct abstract declarators", adding to the already terrible combinatorics of this part of the C grammar. Should be all right now.