Bug 1428182 - 7. Include <link.h> in LUL for Android; r=jseward

Modern NDK headers all have <link.h>, so we should always include it,
and still provide shims for anything we need that's not defined in
<link.h>.

MozReview-Commit-ID: GNBDIe73RFm

--HG--
extra : rebase_source : f1f2eddc73dc1accb3a1eb8445600b015e9e7d52

tools/profiler/lul/LulElfInt.h

@@ -54,6 +54,7 @@
 // (derived from)
 // elfutils.h: Utilities for dealing with ELF files.
 //
+#include <link.h>
 
 #if defined(GP_OS_android)
 
@@ -75,17 +76,12 @@
 #define NT_GNU_BUILD_ID 3
 #endif
 
+#ifndef ElfW
 #define ElfW(type)      _ElfW (Elf, ELFSIZE, type)
 #define _ElfW(e,w,t)    _ElfW_1 (e, w, _##t)
 #define _ElfW_1(e,w,t)  e##w##t
+#endif
 
-//FIXME
-extern "C" {
-  extern char*  basename(const char*  path);
-};
-#else
-
-# include <link.h>
 #endif