Bump pkg-config from 0.3.17 to 0.3.19 in /consensus/enclave/trusted

[dependabot]

Bumps pkg-config from 0.3.17 to 0.3.19.

Changelog

Sourced from pkg-config's changelog.

[0.3.19] - 2020-10-13

Added

• Add README.md to be displayed on crates.io (#111).

• Support for -isystem, -iquote and -idirafter include flags (#115).

Changed

• Improve documentation for cross-compilation (#113).

• Allow overriding system root via the PKG_CONFIG_SYSROOT_DIR or SYSROOT environment variable (#82).

[0.3.18] - 2020-07-11

Fixed

• Use env::var_os() almost everywhere to handle non-UTF8 paths in environment variables, and also improve error handling around environment variable handling (#106).

Changed

• Default the env_metadata build parameter to true instead of false. Whenever a pkg-config related environment variable changes it would make sense to rebuild crates that use pkg-config, or otherwise changes might not be picked up. As such the previous default didn't make much sense (#105).

Commits

• 5432578 Merge pull request #116 from rust-lang/release-0.3.19
• 370b02a Release 0.3.19
• 9d276ae Merge pull request #115 from rust-lang/isystem
• 948f45f Remove unneeded Iterator::collect() and directly work on the iterator instead
• 76df4d8 Add support for -isystem, -iquote, -idirafter include flags
• 7a442be Merge pull request #82 from danielverkamp/sysroot
• e94a533 Don't use /usr as fallback sysroot on Windows
• 81468be Allow overriding system root via environment
• 070b4e9 Merge pull request #113 from kornelski/crossdocs
• 147e102 Improve docs for cross-compilation
• Additional commits viewable in compare view

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[jcape]

This may be tricky, there was an unintentional semver break which prevented our updating to use it in the past, so this is a TBD.