Retrieve filename of shared libs, use in stacktraces

[rdp]

Before:

Unhandled exception: hello (Exception)
  from src/crystal/system/unix/socket.cr:215:5 in 'unbuffered_write'
  from src/io/buffered.cr:136:14 in 'write'
  from src/openssl/bio.cr:31:7 in '->'
  from ???
  from BIO_write
  from ???
  from BIO_ctrl
  from ???
  from ???
  from ???
  from SSL_do_handshake
  from src/openssl/ssl/socket.cr:32:15 in 'initialize'
  from src/openssl/ssl/socket.cr:3:5 in 'new:context:sync_close:hostname'
  from src/http/client.cr:794:5 in 'io'
  from src/http/client.cr:671:5 in 'send_request'
  from src/http/client.cr:603:5 in 'exec_internal_single'
  from src/http/client.cr:587:18 in 'exec_internal'
  from src/http/client.cr:581:7 in 'exec'
  from src/http/client.cr:713:5 in 'exec'
  from src/http/client.cr:745:7 in 'exec'
  from src/http/client.cr:406:3 in 'get'
  from ssl.cr:2:1 in '__crystal_main'
  from src/crystal/main.cr:110:5 in 'main_user_code'
  from src/crystal/main.cr:96:7 in 'main'
  from src/crystal/main.cr:119:3 in 'main'
  from __libc_start_main
  from _start
  from ???

After:

Unhandled exception: hello (Exception)
  from src/crystal/system/unix/socket.cr:215:5 in 'unbuffered_write'
  from src/io/buffered.cr:136:14 in 'write'
  from src/openssl/bio.cr:31:7 in '->'
  from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 in '??'
  from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 in 'BIO_write'
  from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 in '??'
  from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1 in 'BIO_ctrl'
  from /usr/lib/x86_64-linux-gnu/libssl.so.1.1 in '??'
  from /usr/lib/x86_64-linux-gnu/libssl.so.1.1 in '??'
  from /usr/lib/x86_64-linux-gnu/libssl.so.1.1 in '??'
  from /usr/lib/x86_64-linux-gnu/libssl.so.1.1 in 'SSL_do_handshake'
  from src/openssl/ssl/socket.cr:32:15 in 'initialize'
  from src/openssl/ssl/socket.cr:3:5 in 'new:context:sync_close:hostname'
  from src/http/client.cr:794:5 in 'io'
  from src/http/client.cr:671:5 in 'send_request'
  from src/http/client.cr:603:5 in 'exec_internal_single'
  from src/http/client.cr:587:18 in 'exec_internal'
  from src/http/client.cr:581:7 in 'exec'
  from src/http/client.cr:713:5 in 'exec'
  from src/http/client.cr:745:7 in 'exec'
  from src/http/client.cr:406:3 in 'get'
  from ssl.cr:2:1 in '__crystal_main'
  from src/crystal/main.cr:110:5 in 'main_user_code'
  from src/crystal/main.cr:96:7 in 'main'
  from src/crystal/main.cr:119:3 in 'main'
  from /lib/x86_64-linux-gnu/libc.so.6 in '__libc_start_main'
  from ./ssl in '_start'
  from ???

Resolves #8534

[beta-ziliani]

🚀

[rdp]

This doesn't include looking up line numbers within shared libs, but that can be done later if there's demand...or in gdb at present...