[babl/unitybuild: 6/7] Remove useless error (that fails in unity build)

[Félix Piédallu <fpiedallu src gnome org>]

commit b05535901c0159a0163baa7daf2fe3132253308f
Author: Félix Piédallu <felix piedallu me>
Date:   Tue Feb 27 15:24:29 2018 +0100

    Remove useless error (that fails in unity build)

 babl/babl-internal.h |    7 -------
 1 files changed, 0 insertions(+), 7 deletions(-)
---
diff --git a/babl/babl-internal.h b/babl/babl-internal.h
index 896ae81..68ddbc2 100644
--- a/babl/babl-internal.h
+++ b/babl/babl-internal.h
@@ -23,10 +23,6 @@
 #error "config.h must be included prior to babl-internal.h"
 #endif
 
-#ifdef _BABL_H
-#error babl-internal.h included after babl.h
-#endif
-
 #define BABL_MAX_COMPONENTS       32
 #define BABL_CONVERSIONS          5
 
@@ -36,10 +32,7 @@
 #include <math.h>
 #include "assert.h"
 
-#undef  _BABL_INTERNAL_H
 #include "babl.h"
-#define _BABL_INTERNAL_H
-
 #include "babl-classes.h"
 #include "babl-introspect.h"
 #include "babl-class.h"