[test][embedded] Declare embedded-synchronization as a test dependency (#72356)

PR #72293 added the synchronization module to embedded, and it was added
as dependency of `ALL`, but not of the `-test-depends` targets. If one
is using the `-test-depends` targets, the synchronization library for
embedded will not be build, and the test will fail.

This is a follow up to #72329. I had a partial build to test that, and
I did not notice this was also missing.

Author: drodriguez

test/CMakeLists.txt

@@ -314,14 +314,19 @@ foreach(SDK ${SWIFT_SDKS})
         endif()
       endif()
 
-      if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB AND TARGET "embedded-stdlib")
-        list(APPEND test_dependencies "embedded-stdlib")
-      endif()
-      if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB AND TARGET "embedded-darwin")
-        list(APPEND test_dependencies "embedded-darwin")
-      endif()
-      if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB AND TARGET "embedded-concurrency")
-        list(APPEND test_dependencies "embedded-concurrency")
+      if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB)
+        if(TARGET "embedded-stdlib")
+          list(APPEND test_dependencies "embedded-stdlib")
+        endif()
+       if(TARGET "embedded-darwin")
+          list(APPEND test_dependencies "embedded-darwin")
+        endif()
+        if(TARGET "embedded-concurrency")
+          list(APPEND test_dependencies "embedded-concurrency")
+        endif()
+        if(TARGET "embedded-synchronization")
+          list(APPEND test_dependencies "embedded-synchronization")
+        endif()
       endif()
 
       if(NOT "${COVERAGE_DB}" STREQUAL "")