add rp6502 target

libsrc/rp6502/gettimezone.c

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2023 Rumbledethumps
+ *
+ * SPDX-License-Identifier: Zlib
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-License-Identifier: Unlicense
+ */
+
+#include <rp6502.h>
+#include <time.h>
+
+int clock_gettimezone(clockid_t clock_id, struct _timezone *tz)
+{
+    int ax;
+    ria_set_ax(clock_id);
+    ax = ria_call_int_errno(RIA_OP_CLOCK_GETTIMEZONE);
+    if (ax >= 0)
+    {
+        char i;
+        for (i = 0; i < sizeof(struct _timezone); i++)
+            ((char *)tz)[i] = ria_pop_char();
+    }
+    return ax;
+}