[androd] Fix Synchronization Android build

Add Android import for Mutex implementation

Author: hyp

stdlib/public/Synchronization/CMakeLists.txt

@@ -40,7 +40,7 @@ set(SWIFT_SYNCHRONIZATION_DARWIN_SOURCES
   Mutex/DarwinImpl.swift
 )
 
-# Linux sources
+# Linux and Android sources
 
 set(SWIFT_SYNCHRONIZATION_LINUX_SOURCES
   Mutex/LinuxImpl.swift
@@ -102,6 +102,8 @@ add_swift_target_library(swiftSynchronization ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES
     Darwin
   SWIFT_MODULE_DEPENDS_LINUX
     Glibc
+  SWIFT_MODULE_DEPENDS_ANDROID
+    Android
   SWIFT_MODULE_DEPENDS_WINDOWS
     WinSDK
 

stdlib/public/Synchronization/Mutex/LinuxImpl.swift

@@ -11,7 +11,11 @@
 //===----------------------------------------------------------------------===//
 
 import _SynchronizationShims
+#if canImport(Android)
+import Android
+#else
 import Glibc
+#endif
 
 extension Atomic where Value == UInt32 {
   // This returns 'false' on success and 'true' on error. Check 'errno' for the