[PATCH] CMake: Fix arc4random detection

[Brad Smith]

Here is a patch to fix arc4random detection when using CMake.

>From Pascal Stumpf <Pascal.Stumpf at cubes.de>.

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Index: include/llvm/Config/config.h.cmake
===================================================================
--- include/llvm/Config/config.h.cmake	(revision 212648)
+++ include/llvm/Config/config.h.cmake	(working copy)
@@ -25,7 +25,7 @@
 #cmakedefine ENABLE_TIMESTAMPS ${ENABLE_TIMESTAMPS}
 
 /* Define to 1 if you have the `arc4random' function. */
-#cmakedefine HAVE_ARC4RANDOM
+#cmakedefine HAVE_DECL_ARC4RANDOM ${HAVE_DECL_ARC4RANDOM}
 
 /* Define to 1 if you have the `backtrace' function. */
 #cmakedefine HAVE_BACKTRACE ${HAVE_BACKTRACE}