Commits on Jun 24, 2020

1. Fix require failing in Termux on Android …

   Note that this change does not make rbtrace *actually* work in Termux - it just allows an app to start up without an exception when it has `require 'rbtrace'`.
   
   The exception is:
   
   ```
   $ ruby -r rbtrace -e puts
   Traceback (most recent call last):
           1: from /data/data/com.termux/files/usr/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
   /data/data/com.termux/files/usr/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- rbtrace (LoadError)
           2: from /data/data/com.termux/files/usr/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:34:in `require'
           1: from /data/data/com.termux/files/usr/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `rescue in require'
   /data/data/com.termux/files/usr/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `require': dlopen failed: cannot locate symbol "rindex" referenced by "/data/data/com.termux/files/usr/lib/ruby/gems/2.6.0/gems/rbtrace-0.4.13/lib/rbtrace.so"... - /data/data/com.termux/files/usr/lib/ruby/gems/2.6.0/gems/rbtrace-0.4.13/lib/rbtrace.so (LoadError)
   ```
   
   It turns out that Android (9, at least) does not include `rindex` - I believe because it has been [deprecated](https://linux.die.net/man/3/rindex) for many years; `strrchr` is apparently a drop-in replacement.
   
   After that, there was another exception about the `SUN_LEN` symbol missing. I added [this definition](https://stackoverflow.com/a/12628469) for the macro. That then got the gem able to be required without error.
   
   I would have liked to get rbtrace working in Termux, but this is as far as I've been able to progress for now. I'm having trouble with the `ipcs` binary. It's [deliberately not provided by Termux's `util-linux` package](https://github.com/termux/termux-packages/blob/8076aec21f8d4b0dd5f880af1af467961dcbbbbb/packages/util-linux/build.sh#L19) for some reason. With root, I can run Stericson Busybox's `ipcs`, but it just returns this:
   
   ```
   $ su -c /sbin/ipcs
   
   kernel not configured for message queues
   
   kernel not configured for shared memory
   
   kernel not configured for semaphores
   ```
   
   I'm hoping that's not just a quirk of the particular kernel on [my device](https://www.indiegogo.com/projects/cosmo-communicator). But perhaps the shared memory functionality is not actually suppported on Android? I don't yet know. Anyway.
   
   `test.sh` does not work since rbtrace itself does not yet work on Android. The tmpdir change in there gets it one step closer at least - `/tmp` does not exist on Android.
   
   This commit was tested by simply:
   
   ```bash
   $ gem build rbtrace.gemspec && gem install rbtrace-0.4.13.gem && ruby -r rbtrace -e puts
   ```

   

   ZimbiX committed Jun 24, 2020
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