Allow `--backtrace-limit` option to appear in RUBYOPT

There’s no reason to prevent RUBYOPT from controlling the backtrace
limit. In fact, Matz said [0] he was expecting this to be possible.

[0] https://bugs.ruby-lang.org/issues/8661#note-27

1 files changed, 1 insertions, 1 deletions

diff --git a/ruby.c b/ruby.c
index 28579022fe..92ea37b4f6 100644
--- a/ruby.c
+++ b/ruby.c
@@ -1446,7 +1446,7 @@ proc_long_options(ruby_cmdline_options_t *opt, const char *s, long argc, char **
         opt->dump |= DUMP_BIT(help);
         return 0;
     }
-    else if (is_option_with_arg("backtrace-limit", Qfalse, Qfalse)) {
+    else if (is_option_with_arg("backtrace-limit", Qfalse, Qtrue)) {
         char *e;
         long n = strtol(s, &e, 10);
         if (errno == ERANGE || n < 0 || *e) rb_raise(rb_eRuntimeError, "wrong limit for backtrace length");