update lz4 to v1.9.3

Author: burgerrg

LOG

@@ -2280,3 +2280,5 @@
     c/foreign.c c/gc.c c/gcwrapper.c c/intern.c c/io.c c/new-io.c c/number.c
     c/prim.c c/prim5.c c/print.c c/scheme.c c/schlib.c c/schsig.c c/segment.c
     c/thread.c mats/foreign3.c s/mkheader.ss
+- update lz4 to version 1.9.3
+    configure

configure

@@ -427,7 +427,7 @@ else
   if [ "${LZ4Dep}" != "" ] ; then
     if [ ! -f 'lz4/lib/Makefile' ] ; then
       rmdir lz4 > /dev/null 2>&1
-      (curl -L -o v1.9.2.tar.gz https://github.com/lz4/lz4/archive/v1.9.2.tar.gz && tar -xzf v1.9.2.tar.gz && mv lz4-1.9.2 lz4 && rm v1.9.2.tar.gz) || exit 1
+      (curl -L -o v1.9.3.tar.gz https://github.com/lz4/lz4/archive/v1.9.3.tar.gz && tar -xzf v1.9.3.tar.gz && mv lz4-1.9.3 lz4 && rm v1.9.3.tar.gz) || exit 1
     fi
   fi