Another hack to work-around broken vcpkg upgrades.

Add a function to check if libogg is installed but libvorbis isn't, this
means it failed to upgrade libvorbis because libogg wasn't upgraded to
the newest port revision supporting pkg-config, see:

https://github.com/microsoft/vcpkg/issues/13037

In this case, remove libogg recursively and allow the install action to
reinstall SFML and all deps.

This will also fix building link support on appveyor for the time being.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

cmake/Set-Toolchain-vcpkg.cmake

@@ -67,6 +67,25 @@ function(vcpkg_get_first_upgrade vcpkg_exe)
     set(first_upgrade ${first_upgrade} PARENT_SCOPE)
 endfunction()
 
+function(vcpkg_deps_fixup vcpkg_exe)
+    # Get installed list.
+    execute_process(
+        COMMAND ${vcpkg_exe} list
+        OUTPUT_VARIABLE pkg_list
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        ERROR_QUIET
+        WORKING_DIRECTORY ${VCPKG_ROOT}
+    )
+
+    # If libvorbis is NOT installed but libogg is, remove libvorbis recursively.
+    if(pkg_list MATCHES libogg AND (NOT pkg_list MATCHES libvorbis))
+        execute_process(
+            COMMAND "${vcpkg_exe}" remove --recurse libogg:${VCPKG_TARGET_TRIPLET}
+            WORKING_DIRECTORY ${VCPKG_ROOT}
+        )
+    endif()
+endfunction()
+
 function(vcpkg_set_toolchain)
     if(NOT DEFINED ENV{VCPKG_ROOT})
         if(WIN32)
@@ -193,6 +212,8 @@ function(vcpkg_set_toolchain)
     # Limit total installation time to 30 minutes to not overrun CI time limit.
     math(EXPR time_limit "${began} + (30 * 60)")
 
+    vcpkg_deps_fixup("${vcpkg_exe}")
+
     # Install core deps.
     execute_process(
         COMMAND ${vcpkg_exe} install ${VCPKG_DEPS_QUALIFIED}