[Observation] Add missing dependencies.

There should be additional dependencies listed for Observation,
as it's importing various platform modules.

Author: al45tair

stdlib/public/Observation/Sources/Observation/CMakeLists.txt

@@ -32,6 +32,15 @@ add_swift_target_library(swiftObservation ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS
   LINK_FLAGS "${SWIFT_RUNTIME_SWIFT_LINK_FLAGS}"
 
   SWIFT_MODULE_DEPENDS _Concurrency
+  SWIFT_MODULE_DEPENDS_ANDROID Bionic
+  SWIFT_MODULE_DEPENDS_LINUX Glibc
+  SWIFT_MODULE_DEPENDS_LINUX_STATIC Musl
+  SWIFT_MODULE_DEPENDS_FREEBSD Glibc
+  SWIFT_MODULE_DEPENDS_OPENBSD Glibc
+  SWIFT_MODULE_DEPENDS_CYGWIN Glibc
+  SWIFT_MODULE_DEPENDS_HAIKU Glibc
+  SWIFT_MODULE_DEPENDS_WINDOWS WinSDK
+
   INSTALL_IN_COMPONENT stdlib
 
   MACCATALYST_BUILD_FLAVOR "zippered"