tesseract-ocr: New cross package(s)

Tesseract OCR engine.

"cross/tesseract-ocr" - binary itself
"cross/tesseract-ocr-eng" - English data
"cross/tesseract-ocr-equ" - Math / equation detection data
"cross/tesseract-ocr-osd" - Orientation & script detection data (?)

Requires at least v1.69 of Leptonica [sic]