reflect: makeFunc

[visualfc]

• implement reflect.MakeFunc by libffi
• GOOS=js add -sRESERVED_FUNCTION_POINTERS=1 for libffi

TODO libffi use c abi, ret struct type incorret

• correct for reflect.MakeFunc.Call
• correct for reflect.MakeFunc.Interface.(func ...)(...) for wasm32
• incorrect for reflect.MakeFunc.Interface.(func ...)(...) for amd64

// c func
struct T {
    int n;
     int n1;
};

struct T demo2(int n) {
    struct T v = {100, 200};
    return v;
}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.62%. Comparing base (26aaa65) to head (2118849).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/crosscompile/cosscompile.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1148      +/-   ##
==========================================
- Coverage   86.64%   86.62%   -0.02%     
==========================================
  Files          29       29              
  Lines        7343     7344       +1     
==========================================
  Hits         6362     6362              
- Misses        914      915       +1     
  Partials       67       67              

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