array: fix initialization of empty fixed size arrays

compiler/gen_c.v

@@ -59,6 +59,8 @@ fn (p mut Parser) gen_var_decl(name string, is_static bool) string {
 		initializer := p.cgen.cur_line.right(pos)
 		if initializer.len > 0 {
 			p.cgen.resetln(' = {' + initializer.all_after('{') )
+		} else if initializer.len == 0 {
+			p.cgen.resetln(' = { 0 }')
 		}	
 	}
 

vlib/builtin/array_test.v

@@ -164,7 +164,6 @@ const (
 )
 
 fn test_fixed() {
-	/*
 	mut nums := [4]int
 	assert nums[0] == 0
 	assert nums[1] == 0
@@ -174,7 +173,6 @@ fn test_fixed() {
 	assert nums[1] == 7
 	nums2 := [N]int
 	assert nums2[N - 1] == 0
-	*/
 }
 
 fn modify (numbers mut []int) {