added curl prefix for curlbuild.h back until we find a better solution;

it breaks almost all autobuilds.

include/curl/curl.h

@@ -32,7 +32,7 @@
  */
 
 #include "curlver.h"         /* libcurl version defines   */
-#include "curlbuild.h"       /* libcurl build definitions */
+#include "curl/curlbuild.h"  /* libcurl build definitions */
 #include "curlrules.h"       /* libcurl rules enforcement */
 
 /*