Add Expat 2.2.7

[Croydon]

Specify library name and version: expat/2.2.7

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[CLAassistant]

All committers have signed the CLA.

[conan-center-bot]

Sorry, the build is only launched for Early Access Program users. You can request access writing in this issue.

[uilianries]

@lasote we have a bug. @Croydon is a beta user.

[Croydon]

@lasote we have a bug. @Croydon is a beta user.

This got reported internally already. It seems to be case-sensitive and my username seems to be entered lower-case instead of upper-case

[uilianries]

@lasote we have a bug. @Croydon is a beta user.

This got reported internally already. It seems to be case-sensitive and my username seems to be entered lower-case instead of upper-case

Good to know!

[conan-center-bot]

Sorry, the build is only launched for Early Access Program users. You can request access writing in this issue.

[lasote]

@Croydon fixed! Sorry for that.

[Croydon]

@lasote Thanks!

[conan-center-bot]

Some configurations of 'expat/2.2.7' have failed:

• Linux x86_64, Release, gcc 5, libstdc++ . Options: expat:shared:True
  • Hooks errors detected:
    • [HOOK - conan-center.py] post_package(): ERROR: [PC-FILES (KB-H020)] The conan-center repository doesn't allow the packages to contain pcfiles. The packages have to be located using generators and the declaredcpp_infoinformation (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H020)
    • [HOOK - conan-center.py] post_package(): ERROR: [PC-FILES (KB-H020)] Found files:
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[conan-center-bot]

All green! 😊

• expat/2.2.7: Generated 78 packages

[uilianries]

LGTM

[ronaldinzkie]

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