Use the environment locale for strcoll() collation.

src/redis.c

@@ -49,6 +49,7 @@
 #include <math.h>
 #include <sys/resource.h>
 #include <sys/utsname.h>
+#include <locale.h>
 
 /* Our shared "common" objects */
 
@@ -2814,6 +2815,7 @@ int main(int argc, char **argv) {
 #ifdef INIT_SETPROCTITLE_REPLACEMENT
     spt_init(argc, argv);
 #endif
+    setlocale(LC_COLLATE,"");
     zmalloc_enable_thread_safeness();
     zmalloc_set_oom_handler(redisOutOfMemoryHandler);
     srand(time(NULL)^getpid());