Avoid appending empty path to artifact directory.

[jdm]

Issues:

Related to #571 (comment)

The build script for aws-lc-sys appends a library search path to the final linker command line. On Windows environments when building with lld-link.exe, the inclusion of an empty directory at the end of this path can cause a build failure.

The problematic path looks like this: /LIBPATH:C:\\\\a\\\\servo\\\\servo\\\\target\\release\\build\\aws-lc-sys-d847be10163c7448\\out\\build\\artifacts\\

The presence of the \\ at the end of the path causes the subsequent character to be treated as an escaped character, leading to a failure to parse the linker argument that follows this.

Description of changes:

Since the final component of the path is always empty, we can remove it without any behaviour change.

Testing:

Verified this change by building Servo on Windows with my branch of aws-lc-sys. Before the change it failed to build; after the change it builds successfully.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[justsmth]

Thanks for the PR! 🚀

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.89%. Comparing base (c358484) to head (423ec30).
Report is 140 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
- Coverage   95.80%   92.89%   -2.91%     
==========================================
  Files          61       67       +6     
  Lines        8143     9717    +1574     
  Branches        0     9717    +9717     
==========================================
+ Hits         7801     9027    +1226     
- Misses        342      402      +60     
- Partials        0      288     +288     

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