Revert "On some systems printf is a macro"

This reverts commit bc5b600458.

qemu-img.c

@@ -58,7 +58,7 @@ static void format_print(void *opaque, const char *name)
 /* Please keep in synch with qemu-img.texi */
 static void help(void)
 {
-    (printf)("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
+    printf("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
            "usage: qemu-img command [command options]\n"
            "QEMU disk image utility\n"
            "\n"

readline.c

@@ -28,10 +28,6 @@
 #define IS_ESC  1
 #define IS_CSI  2
 
-#ifdef printf
-#undef printf
-#endif
-
 #define printf do_not_use_printf
 
 void readline_show_prompt(ReadLineState *rs)

vl.c

@@ -4022,7 +4022,7 @@ static void version(void)
 static void help(int exitcode)
 {
     version();
-    (printf)("usage: %s [options] [disk_image]\n"
+    printf("usage: %s [options] [disk_image]\n"
            "\n"
            "'disk_image' is a raw hard image image for IDE hard disk 0\n"
            "\n"