Fix build with unreleased leptonica 1.83

leptonica moved most of their type definitions to internal headers. Long
term usages of internal API should be removed, but for now simply
include the internal header to allow tesseract to be built.

Author: p12tic

src/textord/devanagari_processing.cpp

@@ -28,6 +28,9 @@
 #include "tordmain.h"
 
 #include <allheaders.h>
+#if (LIBLEPT_MAJOR_VERSION == 1 && LIBLEPT_MINOR_VERSION >= 83) || LIBLEPT_MAJOR_VERSION > 1
+#include "pix_internal.h"
+#endif
 
 namespace tesseract {