racket: update to 8.18

Signed-off-by: Kaiyang Wu <[email protected]>

Author: OriginCode

lang-lisp/racket/autobuild/build

@@ -1,8 +1,7 @@
 # FIXME: Upstream hacks generated `configure` script which breaks autobuild's
 # autotools default `AUTOTOOLS_DEF` arguments.
 abinfo "Building racket ..."
-cd "$SRCDIR"
-./configure \
+"$SRCDIR"/configure \
     --prefix=/usr \
     --sysconfdir=/etc \
     --localstatedir=/var \