Combination of static and stock specifiers not allowed in function declarations

[Daniel-Cortez]

Issue description:

The compiler allows to use a combination of static and stock class specifiers in function definitions and old-style declarations, but doesn't allow it in new-style declarations.

Minimal complete verifiable example (MCVE):

static stock Func(); // no errors
static stock Func() return 0; // no errors
forward static stock Func(); // error 010: invalid function or declaration

Workspace Information:

• Compiler version: 3.2.3664, 3.10.10
• Command line arguments provided (or sampctl version):
• Operating System:

[stale]

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