Commits on May 31, 2023

1. Append flags from environment variables. …

   According to the `mkmf.rb#init_mkmf`, there are command line options below.
   
   * `--with-cflags` to set the `cflags`
   * `--with-ldflags` to set the `ldflags`
   
   For example the following command compiles with the specified flags. Note that
   `MAKEFLAGS` is to print the compiler command lines.
   
   ```
   $ MAKEFLAGS="V=1" \
     bundle exec rake compile -- \
     --with-cflags="-Wundef -Werror" \
     --with-ldflags="-fstack-protector"
   ```
   
   However, I couldn't find command line options to append the flags. And this
   commit is to append the `cflags` and `ldflags` by the environment variables.
   
   ```
   $ MAKEFLAGS="V=1" \
     RUBY_OPENSSL_EXTCFLAGS="-Wundef -Werror" \
     RUBY_OPENSSL_EXTLDFLAGS="-fstack-protector" \
     bundle exec rake compile
   ```

   

   junaruga committed May 31, 2023
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