cgen: fix [packed] struct support for tcc

Author: spytheman

vlib/v/gen/c/cgen.v

@@ -2025,13 +2025,6 @@ fn (mut g Gen) stmt(node ast.Stmt) {
 			if node.is_union {
 				g.typedefs.writeln('typedef union $name $name;')
 			} else {
-				/*
-				attrs := if node.attrs.contains('packed') {
-					'__attribute__((__packed__))'
-				} else {
-					''
-				}
-				*/
 				g.typedefs.writeln('typedef struct $name $name;')
 			}
 		}

vlib/v/gen/c/struct.v

@@ -313,6 +313,10 @@ fn (mut g Gen) struct_decl(s ast.Struct, name string, is_anon bool) {
 				pre_pragma += '#pragma pack(push, $attr.arg)\n'
 				post_pragma += '#pragma pack(pop)'
 			}
+			'packed' {
+				pre_pragma += '#pragma pack(push, 1)\n'
+				post_pragma += '#pragma pack(pop)'
+			}
 			else {}
 		}
 	}