Fixes#37184
When use libexif provide usage, you will get three error:
````
1> [CMake] CMake Error at F:/test/vcpkg/installed/x64-windows/share/unofficial-libexif/unofficial-libexif-config.cmake:10 (find_library):
1> [CMake] Syntax error in cmake code at
1> [CMake]
1> [CMake] F:/test/vcpkg/installed/x64-windows/share/unofficial-libexif/unofficial-libexif-config.cmake:10
1> [CMake]
1> [CMake] when parsing string
1> [CMake]
1> [CMake] ${z_vcpkg_LIBEXIF_root }/lib
1> [CMake]
1> [CMake] Invalid character (' ') in a variable name: 'z_vcpkg_LIBEXIF_root'
````
````
1> [CMake] CMake Error at F:/test/vcpkg/installed/x64-windows/share/unofficial-libexif/unofficial-libexif-config.cmake:10 (find_library):
1> [CMake] Could not find Z_VCPKG_LIBEXIF_LIBRARY_RELEASE using the following names:
1> [CMake] libexif
````
````
1> [CMake] CMake Error in CMakeProject1/CMakeLists.txt:
1> [CMake] Imported target "unofficial::libexif::libexif" includes non-existent path
1> [CMake]
1> [CMake] "/include"
````
Change the `unofficial-libexif-config.cmake` file to fix usage error.
Usage tested successfully by `libexif:x64-windows`:
````
libexif provides CMake targets:
# this is heuristically generated, and may not be correct
find_package(unofficial-libexif CONFIG REQUIRED)
target_link_libraries(main PRIVATE unofficial::libexif::libexif)
````
- [x] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md).
- [ ] ~~SHA512s are updated for each updated download.~~
- [ ] ~~The "supports" clause reflects platforms that may be fixed by
this new version.~~
- [ ] ~~Any fixed [CI
baseline](https://github.com/microsoft/vcpkg/blob/master/scripts/ci.baseline.txt)
entries are removed from that file.~~
- [ ] ~~Any patches that are no longer applied are deleted from the
port's directory.~~
- [x] The version database is fixed by rerunning `./vcpkg x-add-version
--all` and committing the result.
- [x] Only one version is added to each modified port's versions file.
---------
Co-authored-by: Jon <v-zhli17@microsoft.com>
* [vtk] Fix the dependency curl of proj
* version
* [libexif] Change to the official build system
* add port-version
* version
* revert
* libexif
* version
* default feature nls
* version
* update
* format
* version
* revert
* vdb
* version
