Merge pull request swiftlang#79962 from swiftlang/egorzhdan/libcxx-exec

[cxx-interop] Fix libc++ tests

Author: egorzhdan

test/Interop/Cxx/stdlib/libcxx-module-interface.swift

@@ -11,6 +11,9 @@
 // This test is specific to libc++ and therefore only runs on Darwin platforms.
 // REQUIRES: OS=macosx || OS=ios
 
+// Since this test runs check-libcxx-version, it requires execution.
+// REQUIRES: executable_test
+
 // CHECK-STD: import CxxStdlib.iosfwd
 // CHECK-STD: import CxxStdlib.string
 

test/Interop/Cxx/stdlib/libcxx-symbolic-module-interface.swift

@@ -11,6 +11,9 @@
 // REQUIRES: OS=macosx
 // REQUIRES: swift_feature_ImportSymbolicCXXDecls
 
+// Since this test runs check-libcxx-version, it requires execution.
+// REQUIRES: executable_test
+
 // CHECK: enum std {
 // CHECK: enum __1 {