[CMake] Always define runtimes-test-depends (#73629)

This allows the parent build to depend on this target unconditionally
even when the tests are disabled.

Author: petrhosek

runtimes/CMakeLists.txt

@@ -224,12 +224,14 @@ foreach(entry ${runtimes})
   add_subdirectory(${entry} ${projName})
 endforeach()
 
+# Define runtimes-test-depends so the parent build can use it unconditionally.
+add_custom_target(runtimes-test-depends)
+
 if(LLVM_INCLUDE_TESTS)
   # LLVM_RUNTIMES_LIT_DEPENDS is populated when lit tests are added between
   # umbrella_list_testsuite begin and end. The bootstrap runtimes builds
   # currently assumes this target exists.
   get_property(LLVM_RUNTIMES_LIT_DEPENDS GLOBAL PROPERTY LLVM_RUNTIMES_LIT_DEPENDS)
-  add_custom_target(runtimes-test-depends)
   if(LLVM_RUNTIMES_LIT_DEPENDS)
     # add_dependencies complains if called with no dependencies
     add_dependencies(runtimes-test-depends ${LLVM_RUNTIMES_LIT_DEPENDS})