LLVM Minix changes

- import libcxx
 - reduce targets to the one when compiled as a tools

Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496

common/lib/libc/string/popcount32.c

@@ -76,8 +76,3 @@ __strong_alias(popcount, popcount32)
 #if ULONG_MAX == 0xffffffffU
 __strong_alias(popcountl, popcount32)
 #endif
-
-#if defined(__minix)
-__strong_alias(__popcountsi2, popcount32)
-__strong_alias(__popcountdi2, popcount32)
-#endif

common/lib/libprop/prop_object.c

@@ -975,6 +975,9 @@ _prop_object_internalize_map_file(const char *fname)
  *	Unmap a file previously mapped for internalizing.
  */
 void
+#if defined(__minix)
+__dead
+#endif /* defined(__minix) */
 _prop_object_internalize_unmap_file(
     struct _prop_object_internalize_mapped_file *mf)
 {