rbutil: Merge rbutil with utils folder.

rbutil uses several components from the utils folder, and can be
considered part of utils too. Having it in a separate folder is an
arbitrary split that doesn't help anymore these days, so merge them.

This also allows other utils to easily use libtools.make without the
need to navigate to a different folder.

Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21

utils/bspatch/bspatch.h

@@ -0,0 +1,19 @@
+/*
+ *  Simple wrapper for the bspatch entry point.
+ */
+
+#ifndef _BSPATCH_H
+#define _BSPATCH_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int apply_bspatch(const char *infile, const char *outfile, const char *patchfile);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _BSPATCH_H */