[cmake] OpenBSD uses libc++.

3405691582 · 3405691582 · commit 5f7f7f5cdd5d · 2022-05-13T15:15:28.000-04:00
Therefore, do not generate a libstdcxx.modulemap. See also #58497.
diff --git a/cmake/modules/SwiftCXXUtils.cmake b/cmake/modules/SwiftCXXUtils.cmake
@@ -2,6 +2,5 @@
 set(SWIFT_LIBSTDCXX_PLATFORMS
     "LINUX"
     "FREEBSD"
-    "OPENBSD"
     "CYGWIN"
     "HAIKU")
