Auto merge of #12136 - ConnorGBrewster:servo_version_reporter, r=asajeffrey

Send servo version in mozbrowser error.

<!-- Please describe your changes on the following line: -->
Adds support for sending a version string to b.html so we can put the servo version in the auto generated issue reports.

r? @asajeffrey

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #12083 (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [X] These changes do not require tests because sending servo version on mozbrwosererror for issue reporter.

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components/servo/main.rs

@@ -40,6 +40,7 @@ use servo::Browser;
 use servo::compositing::windowing::WindowEvent;
 use servo::util::opts::{self, ArgumentParsingResult};
 use servo::util::panicking::initiate_panic_hook;
+use servo::util::servo_version;
 use std::process;
 use std::rc::Rc;
 
@@ -104,7 +105,7 @@ fn main() {
     }
 
     if opts::get().is_printing_version {
-        println!("Servo {}{}", env!("CARGO_PKG_VERSION"), env!("GIT_INFO"));
+        println!("{}", servo_version());
         process::exit(0);
     }