textord/makerow.cpp: Fix compiler warnings
textord/makerow.cpp: Fix compiler warnings

Compiler warnings from clang:

src/textord/makerow.cpp:2579:36: warning:
 cast from 'const void *' to 'BLOBNBOX **' drops const qualifier [-Wcast-qual]
src/textord/makerow.cpp:2581:36: warning:
 cast from 'const void *' to 'BLOBNBOX **' drops const qualifier [-Wcast-qual]
src/textord/makerow.cpp:2601:31: warning:
 cast from 'const void *' to 'TO_ROW **' drops const qualifier [-Wcast-qual]
src/textord/makerow.cpp:2603:31: warning:
 cast from 'const void *' to 'TO_ROW **' drops const qualifier [-Wcast-qual]
src/textord/makerow.cpp:2623:31: warning:
 cast from 'const void *' to 'TO_ROW **' drops const qualifier [-Wcast-qual]
src/textord/makerow.cpp:2625:31: warning:
 cast from 'const void *' to 'TO_ROW **' drops const qualifier [-Wcast-qual]

Warning from lgtm:

Local variable 'blob' hides a parameter of the same name.

Signed-off-by: Stefan Weil <8d4c780fcfdc41841e5070f4c43da8958ba6aec0@weilnetz.de>

amitdo/tesseract,UB-Mannheim/tesseract,tesseract-ocr/tesseract,stweil/tesseract,tesseract-ocr/tesseract,amitdo/tesseract,UB-Mannheim/tesseract,tesseract-ocr/tesseract,stweil/tesseract,jbarlow83/tesseract,jbarlow83/tesseract,amitdo/tesseract,amitdo/tesseract,jbarlow83/tesseract,UB-Mannheim/tesseract,stweil/tesseract,UB-Mannheim/tesseract,UB-Mannheim/tesseract,jbarlow83/tesseract,tesseract-ocr/tesseract,tesseract-ocr/tesseract,stweil/tesseract,stweil/tesseract,amitdo/tesseract,jbarlow83/tesseract