[azure-iot-sdk-c] Fixed the CMake config export. (#11017)

2020-05-08T20:33:23+00:00

* Make the CMake config export correctly.

* Update CONTROL

* Update CONTROL

* Update portfile.cmake

* Update portfile.cmake

* Update portfile.cmake

vcpkg/ports/azure-iot-sdk-c/fix-cmake.patch, branch master

[azure-iot-sdk-c] Fixed the CMake config export. (#11017)