[boilerplate] Add missing header file.

Deleted so many, and forgot to add just this little one. Sigh.

boilerplate/cairo-boilerplate-private.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright © 2009 Chris Wilson
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Red Hat, Inc. not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Red Hat, Inc. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#ifndef _CAIRO_BOILERPLATE_PRIVATE_H_
+#define _CAIRO_BOILERPLATE_PRIVATE_H_
+
+#include "cairo-boilerplate.h"
+
+CAIRO_BEGIN_DECLS
+
+void
+_cairo_boilerplate_register_all (void);
+
+void
+_cairo_boilerplate_register_backend (const cairo_boilerplate_target_t *targets,
+				     unsigned int count);
+
+#define CAIRO_BOILERPLATE(name__, targets__) \
+void _register_##name__ (void); \
+void _register_##name__ (void) { \
+    _cairo_boilerplate_register_backend (targets__, \
+					 sizeof (targets__) / sizeof (targets__[0])); \
+}
+
+CAIRO_END_DECLS
+
+#endif /* _CAIRO_BOILERPLATE_PRIVATE_H_ */