Add support for freetype-gl

[caseymcc]

• I've followed this guide
  step by step carefully. Yes

• I've tested this package remotely and have excluded all broken builds.
  Here is the links to the Travis/AppVeyor with status "All passed":

  • https://ci.appveyor.com/project/caseymcc/hunter-testing/builds/34793318
  • https://travis-ci.org/github/caseymcc/hunter-testing/builds/720109095

• I have submitted CI configs to https://github.com/cpp-pm/hunter-testing targeting pkg.template branch,
  see this merged pull request test for freetype-gl hunter-testing#74

Need a package repo for https://github.com/caseymcc/freetype-gl/tree/hunter and release.

[rbsheth]

@caseymcchttps://github.com/cpp-pm/freetype-gl

[caseymcc]

PR created for package cpp-pm/freetype-gl#1

[rbsheth]

@caseymcchttps://github.com/cpp-pm/freetype-gl/releases/tag/v0.0.0-1a8c007-p0

[caseymcc]

@rbsheth update with the cpp-pm package release, pr for the test at cpp-pm/hunter-testing#74

https://travis-ci.org/github/caseymcc/hunter-testing/builds/726012729
https://ci.appveyor.com/project/caseymcc/hunter-testing/builds/35136911

[caseymcc]

updated to use the github actions CI

[caseymcc]

@rbsheth What is missing for this PR?

[rbsheth]

@caseymcc couple small things need fixing. Then it will be merged!

[rahulshethsc]

Released: https://github.com/cpp-pm/hunter/releases/tag/v0.23.280