Added CUUID to Glibc

Necessary for SR-1756 and SE-0069

Author: colemancda

stdlib/public/Platform/glibc.modulemap.gyb

@@ -391,3 +391,9 @@ module SwiftGlibc [system] {
     }
   }
 }
+
+module CUUID [system] {
+  header "${GLIBC_INCLUDE_PATH}/uuid/uuid.h"
+  link "uuid"
+  export *
+}

validation-test/stdlib/CUUID.swift

@@ -0,0 +1,21 @@
+// RUN: %target-run-stdlib-swift
+// REQUIRES: executable_test
+
+// REQUIRES: OS=linux-gnu
+
+import Swift
+import StdlibUnittest
+
+
+import CUUID
+
+var CUUIDTestSuite = TestSuite("CUUID")
+
+CUUIDTestSuite.test("uuid") {
+  var uuid: uuid_t = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
+  withUnsafeMutablePointer(&uuid) {
+    uuid_generate_random(unsafeBitCast($0, to: UnsafeMutablePointer<UInt8>.self))
+  }
+}
+
+runAllTests()