bsd-user/main.c: Drop syscall flavor arg -bsd

We've not realistically been able to actually run any bsd program on any
other bsd program. They are too diverged to do this easily. The current
code is setup to do it, but implementing it is hard. Stop pretending
that we can do this.

Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/bsd-user/main.c b/bsd-user/main.c
index f1d58e9..bddb830 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -164,7 +164,6 @@
            "-E var=value      sets/modifies targets environment variable(s)\n"
            "-U var            unsets targets environment variable(s)\n"
            "-B address        set guest_base address to address\n"
-           "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
            "\n"
            "Debug options:\n"
            "-d item1[,...]    enable logging of specified items\n"
@@ -392,17 +391,6 @@
             have_guest_base = true;
         } else if (!strcmp(r, "drop-ld-preload")) {
             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
-        } else if (!strcmp(r, "bsd")) {
-            if (!strcasecmp(argv[optind], "freebsd")) {
-                bsd_type = target_freebsd;
-            } else if (!strcasecmp(argv[optind], "netbsd")) {
-                bsd_type = target_netbsd;
-            } else if (!strcasecmp(argv[optind], "openbsd")) {
-                bsd_type = target_openbsd;
-            } else {
-                usage();
-            }
-            optind++;
         } else if (!strcmp(r, "seed")) {
             seed_optarg = optarg;
         } else if (!strcmp(r, "singlestep")) {