build: dereference a variable when checking (NFC)

Some versions of CMake dereference the variable here and others do not.
Explicitly dereference to ensure that the library name is properly set.
Failure to do so will fail to load the library as the output path
becomes the name.

Author: compnerd

cmake/modules/AddSwift.cmake

@@ -1905,7 +1905,7 @@ function(add_swift_target_library name)
     if(SWIFTLIB_SHARED)
       if(sdk IN_LIST SWIFT_APPLE_PLATFORMS)
         list(APPEND swiftlib_link_flags_all "-dynamiclib -Wl,-headerpad_max_install_names")
-      elseif(sdk STREQUAL ANDROID)
+      elseif(${sdk} STREQUAL ANDROID)
         list(APPEND swiftlib_link_flags_all "-shared")
         # TODO: Instead of `lib${name}.so` find variable or target property which already have this value.
         list(APPEND swiftlib_link_flags_all "-Wl,-soname,lib${name}.so")