Deno: Display build configuration when "deno -v" is run

[ry]

This information can be captured during the build with:

gn args target/debug/ --list --short --overrides-only

So we would have

> deno -v
deno_version = "0.2.2"
v8_version "7.1.302.4"
typescript_version = "3.2.1"

cc_wrapper = "/usr/local/bin/ccache"
clang_use_chrome_plugins = false
is_cfi = false
is_component_build = false
is_desktop_linux = false
proprietary_codecs = false
rust_treat_warnings_as_errors = true
rustc_wrapper = "/Users/rld/.cargo/bin/sccache"
safe_browsing_mode = 0
symbol_level = 1
toolkit_views = false
treat_warnings_as_errors = true
use_aura = false
use_dbus = false
use_gio = false
use_glib = false
use_jumbo_build = true
use_ozone = false
use_udev = false
v8_deprecation_warnings = false
v8_enable_gdbjit = false
v8_enable_i18n_support = false
v8_experimental_extra_library_files = []
v8_extra_library_files = []
v8_imminent_deprecation_warnings = false
v8_monolithic = false
v8_untrusted_code_mitigations = false
v8_use_external_startup_data = false
v8_use_snapshot = true

[kevinkassimo]

How about making it deno -vv? (Or --vv if short option would not work)