replacing call to outdated smpdf executable

tools/compresspdf2ebookpdf

@@ -25,13 +25,7 @@ echo "PDF lossy compression using:"
 echo $PDF2PDFFLAGS -sOutputFile="$F-compressed.pdf" "$1" $pdfmarks
 gs $PDF2PDFFLAGS -sOutputFile="$F-compressed.pdf" "$1" $pdfmarks
 
-# pdftk is not maintained anymore and does not work on my mac...
-#echo pdftk $1 dump_data output /tmp/pdftk-report.txt
-#pdftk $1 dump_data output /tmp/pdftk-report.txt
-#echo pdftk /tmp/compressed.pdf update_info /tmp/pdftk-report.txt output $F-compressed.pdf
-#pdftk /tmp/compressed.pdf update_info /tmp/pdftk-report.txt output $F-compressed.pdf
-
-# Chrome has issues if exiftool is run last. Make sure smpdf comes afterwards
+# Chrome has issues if exiftool is run last. Make sure cpdf comes afterwards
 if ! [ -x "$(command -v exiftool)" ]; then
     echo "Could not find exiftool - Some tags might have been lost"
 else
@@ -41,21 +35,16 @@ else
     exiftool -overwrite_original -TagsFromFile "$1" "$F-compressed.pdf"
 fi
 
-if ! [ -x "$(command -v smpdf)" ]; then
-    echo "Could not find smpdf - Skipping additional lossless compression"
-    echo See https://www.coherentpdf.com/compression.html
+if ! [ -x "$(command -v cpdf)" ]; then
+    echo "Could not find cpdf - Skipping additional lossless compression and annotation copying"
+    echo "See https://github.com/johnwhitington/cpdf-source"
 else
     # Use smpdf to further compress the file in a lossless fashion
     echo "PDF lossless compression using:"
-    echo smpdf "$F-compressed.pdf" -o "$F-compressed2.pdf"
-    smpdf "$F-compressed.pdf" -o "$F-compressed2.pdf"
+    echo cpdf  -squeeze "$F-compressed.pdf" -o "$F-compressed2.pdf"
+    cpdf  -squeeze "$F-compressed.pdf" -o "$F-compressed2.pdf"
     mv "$F-compressed2.pdf" "$F-compressed.pdf"
-fi
-
-if ! [ -x "$(command -v cpdf)" ]; then
-    echo "Could not find cpdf - Skipping additional annotation copying"
-    echo See https://www.coherentpdf.com/compression.html
-else
+
     # Use cpdf to copy information over
     echo "PDF ID copy using:"
     echo cpdf -copy-id-from "$1" "$F-compressed.pdf" -o "$F-compressed2.pdf"