Simplify autogen.sh

Make use of the autoreconf tool

autogen.sh

 #!/bin/sh
-
-glibtoolize=$(which glibtoolize 2> /dev/null)
-if [ ${#glibtoolize} -gt 0 ]
-then libtoolize=glibtoolize
-else libtoolize=libtoolize
-fi
-
 mkdir -p m4
-aclocal -I m4
-autoconf
-autoheader
-$libtoolize --copy --force
-automake --add-missing --copy
-
+autoreconf --install --force