Lua debugger: use sds_malloc() to allocate eval cli array.

Redis-cli handles the debugger "eval" command in a special way since
sdssplitargs() would not be ok: we need to send the Redis debugger the
whole Lua script without any parsing. However in order to later free the
argument vector inside redis-cli using just sdsfreesplitres(), we need
to allocate the array of SDS pointers using the same allocator SDS is
using, that may differ to what Redis is using.

So now a newer version of SDS exports sds_malloc() and other allocator
functions to give access, to the program it is linked to, the allocator
used internally by SDS.

src/redis-cli.c

@@ -1050,7 +1050,7 @@ static sds *cliSplitArgs(char *line, int *argc) {
     if (config.eval_ldb && (strstr(line,"eval ") == line ||
                             strstr(line,"e ") == line))
     {
-        sds *argv = zmalloc(sizeof(sds)*2);
+        sds *argv = sds_malloc(sizeof(sds)*2);
         *argc = 2;
         int len = strlen(line);
         int elen = line[1] == ' ' ? 2 : 5; /* "e " or "eval "? */