universalambigs: Add missing include file
universalambigs: Add missing include file

This allows fixing two compiler warnings from clang++:

    src/ccutil/universalambigs.cpp:23:19: warning: no previous extern declaration for non-static variable 'kUniversalAmbigsFile' [-Wmissing-variable-declarations]
    src/ccutil/universalambigs.cpp:19019:18: warning: no previous extern declaration for non-static variable 'ksizeofUniversalAmbigsFile' [-Wmissing-variable-declarations]

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

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