cgen: fix call with fixed array of builtin struct (#26328)

Author: Krchi

vlib/v/gen/c/cgen.v

@@ -1763,7 +1763,7 @@ pub fn (mut g Gen) write_typedef_types() {
 			.array_fixed {
 				info := sym.info as ast.ArrayFixed
 				elem_sym := g.table.sym(info.elem_type)
-				if elem_sym.is_builtin() {
+				if elem_sym.kind != .struct && elem_sym.is_builtin() {
 					styp := sym.cname
 					len := info.size
 					if len > 0 {
@@ -7090,9 +7090,10 @@ fn (mut g Gen) write_types(symbols []&ast.TypeSymbol) {
 			}
 			ast.ArrayFixed {
 				elem_sym := g.table.sym(sym.info.elem_type)
-				if !elem_sym.is_builtin() && !sym.info.elem_type.has_flag(.generic)
-					&& !sym.info.is_fn_ret && (!g.pref.skip_unused
-					|| (!sym.info.is_fn_ret && sym.idx in g.table.used_features.used_syms)) {
+				if (elem_sym.kind == .struct || !elem_sym.is_builtin())
+					&& !sym.info.elem_type.has_flag(.generic) && !sym.info.is_fn_ret
+					&& (!g.pref.skip_unused || (!sym.info.is_fn_ret
+					&& sym.idx in g.table.used_features.used_syms)) {
 					// .array_fixed {
 					styp := sym.cname
 					// array_fixed_char_300 => char x[300]

vlib/v/tests/builtin_arrays/fixed_array_of_builtin_struct_with_fn_call_test.v

@@ -0,0 +1,8 @@
+fn get_foo_array(arr [2]VAttribute) []VAttribute {
+	return [arr[0], arr[1]]
+}
+
+fn test_main() {
+	arr := get_foo_array([VAttribute{}, VAttribute{}]!)
+	assert arr == get_foo_array([VAttribute{}, VAttribute{}]!)
+}