gh-37044: update ECL to 23.9.9, remove obsolete stuff from spkg-install
    
ECL 23.9.9 has been released in Sept 2023, 2.5 years after 21.2.1 we
have.
Time to upgrade.

See the announcement for [ECL](https://ecl.common-
lisp.dev/posts/ECL-2399-release.html)
    
URL: #37044
Reported by: Dima Pasechnik
Reviewer(s): Michael Orlitzky

Author: Release Manager

build/pkgs/ecl/checksums.ini

@@ -1,5 +1,5 @@
 tarball=ecl-VERSION.tgz
-sha1=c41838960964c6e0b9b83a08bca1f717ccc6951e
-md5=0c9e0437dbf3a7f1b00da32b7794a3b0
-cksum=1854014871
+sha1=612f61f87eedb271025095306eca78d19f3991db
+md5=16bcfd2ce9730691f88e74edaab790af
+cksum=1542706373
 upstream_url=https://common-lisp.net/project/ecl/static/files/release/ecl-VERSION.tgz

build/pkgs/ecl/package-version.txt

@@ -1 +1 @@
-21.2.1
+23.9.9

build/pkgs/ecl/spkg-install.in

@@ -38,19 +38,3 @@ exec </dev/null
 
 sdh_make
 sdh_make_install
-
-# Create symbolic link to lib/ecl-version directory.
-# Also create a symbolic link lib/ecl/ecl -> include/ecl.
-# This is important when the Sage install is moved, see Trac #14662.
-cd "$SAGE_DESTDIR$SAGE_LOCAL/lib/" && rm -f ecl && ln -s ecl-* ecl
-if [ $? -ne 0 ]; then
-    echo >&2 "Error - Failed to create symbolic link to ECL library"
-    echo >&2 "directory ... exiting"
-    exit 1
-fi
-cd "$SAGE_DESTDIR$SAGE_LOCAL/lib/ecl" && rm -f ecl && ln -s ../../include/ecl ecl
-if [ $? -ne 0 ]; then
-    echo >&2 "Error - Failed to create symbolic link to ECL include"
-    echo >&2 "directory ... exiting"
-    exit 1
-fi