build: correct flags for FoundationNetworking

Previous inlining had diverged the flags handling and we were no longer
enabling optimizations or testability on FoundationNetworking.  Correct
the flag evaluation.

Author: compnerd

CMakeLists.txt

@@ -358,8 +358,8 @@ add_swift_library(FoundationNetworking
                     ${deployment_enable_libdispatch}
                     -I;${CMAKE_CURRENT_BINARY_DIR}/swift
                     ${libdispatch_cflags}
-                    ${swift_enable_testing}
-                    ${swift_optimization_flags}
+                    $<$<BOOL:ENABLE_TESTING>:-enable-testing>
+                    $<$<NOT:$<CONFIG:Debug>>:-O>
                   DEPENDS
                     uuid
                     CoreFoundation