[autogen.sh:] Reduce in-script comment block width to 80 characters.

This is with respect to the comment preceding the `libtoolize`/`glibtoolize` existence check I introduced.

autogen.sh

@@ -46,9 +46,10 @@ if [ "$1" = "clean" ]; then
     find . -iname "Makefile.in" -type f -exec rm '{}' +
 fi
 
-# Prevent any errors that might result from failing to properly invoke `libtoolize` or `glibtoolize,` whichever 
-# is present on your system, from occurring by testing for its existence and capturing the absolute path to its 
-# location for caching purposes prior to using it later on in 'Step 2:'  
+# Prevent any errors that might result from failing to properly invoke 
+# `libtoolize` or `glibtoolize,` whichever is present on your system, 
+# from occurring by testing for its existence and capturing the absolute path to 
+# its location for caching purposes prior to using it later on in 'Step 2:'  
 if command -v libtoolize >/dev/null 2>&1; then
   LIBTOOLIZE="$(command -v libtoolize)"
 elif command -v glibtoolize >/dev/null 2>&1; then