Fixed incorrect OS detection

src/asm/Finalize.go

@@ -31,11 +31,11 @@ func (a Assembler) Finalize(dlls dll.List) ([]byte, []byte) {
 	)
 
 	switch config.TargetOS {
-	case "linux":
+	case config.Linux:
 		headerEnd = elf.HeaderEnd
-	case "macos":
+	case config.Mac:
 		headerEnd = macho.HeaderEnd
-	case "windows":
+	case config.Windows:
 		headerEnd = pe.HeaderEnd
 	}
 
@@ -443,7 +443,7 @@ restart:
 		binary.LittleEndian.PutUint32(slice, uint32(address))
 	}
 
-	if config.TargetOS == "windows" {
+	if config.TargetOS == config.Windows {
 		if len(data) == 0 {
 			data = []byte{0}
 		}