Remove deprecated WITH_HOST_DALVIK.

Bug: 13751317
Fix the Mac build:
 - disable x86 selector removal that causes OS/X 10.9 kernel panics,
 - madvise don't need does zero memory on the Mac, factor into MemMap
   routine,
 - switch to the elf.h in elfutils to avoid Linux kernel dependencies,
 - we can't rely on exclusive_owner_ being available from other pthread
   libraries so maintain our own when futexes aren't available (we
   can't rely on the OS/X 10.8 hack any more),
 - fix symbol naming in assembly code,
 - work around C library differences,
 - disable backtrace in DumpNativeStack to avoid a broken libbacktrace
   dependency,
 - disable main thread signal handling logic,
 - align the stack in stub_test,
 - use $(HOST_SHLIB_SUFFIX) rather than .so in host make file variables.

Not all host tests are passing on the Mac with this change. dex2oat
works as does running HelloWorld.
Change-Id: I5a232aedfb2028524d49daa6397a8e60f3ee40d3
diff --git a/runtime/native/dalvik_system_DexFile.cc b/runtime/native/dalvik_system_DexFile.cc
index 2c24e33..7e3810c 100644
--- a/runtime/native/dalvik_system_DexFile.cc
+++ b/runtime/native/dalvik_system_DexFile.cc
@@ -17,7 +17,11 @@
 #include <algorithm>
 #include <set>
 #include <fcntl.h>
+#ifdef __linux__
 #include <sys/sendfile.h>
+#else
+#include <sys/socket.h>
+#endif
 #include <sys/stat.h>
 #include <unistd.h>
 
@@ -241,7 +245,12 @@
     return;
   }
 
+#ifdef __linux__
   if (sendfile(dst.get(), src.get(), nullptr, stat_src.st_size) == -1) {
+#else
+  off_t len;
+  if (sendfile(dst.get(), src.get(), 0, &len, nullptr, 0) == -1) {
+#endif
     PLOG(ERROR) << "Failed to copy profile file " << oldfile << " to " << newfile
       << ". My uid:gid is " << getuid() << ":" << getgid();
   }