Merge pull request #3930 from jeroen/patch-1

Fix tesseract.pc from cmake to match autotools

tesseract.pc.cmake

@@ -7,6 +7,7 @@ Name: @tesseract_NAME@
 Description: An OCR Engine that was developed at HP Labs between 1985 and 1995... and now at Google.
 URL: https://github.com/tesseract-ocr/tesseract
 Version: @tesseract_VERSION@
+Requires.private: lept
 Libs: -L${libdir} -l@tesseract_OUTPUT_NAME@ @libarchive_LIBS@ @libcurl_LIBS@ @TENSORFLOW_LIBS@
 Libs.private:
 Cflags: -I${includedir}