Mac 14 build

I got a Mac in the lab and both tesseract and cpp11tesseract fail with Mac 14 The GH-Actions have the same issue ``` In file included from RcppExports.cpp:4: ./tesseract_types.h:2:10: fatal error: 'leptonica/allheaders.h' file not found #include <leptonica/allheaders.h> ^~~~~~~~~~~~~~~~~~~~~~~~ ```