elf: Build dl-tls.o with early startup symbol redirections

This is required when building for powerpc64le POWER8 with GCC 8
at least.

Fixes commit cbd9fd2369 ("Consolidate
TLS block allocation for static binaries with ld.so").

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

csu/libc-tls.c

@@ -30,6 +30,7 @@
 #include <dl-extra_tls.h>
 #include <array_length.h>
 #include <elf/dl-tls_block_align.h>
+#include <dl-symbol-redir-ifunc.h>
 
 #ifdef SHARED
  #error makefile bug, this file is for static only

elf/dl-tls.c

@@ -39,6 +39,12 @@
 
 #include <dl-extra_tls.h>
 
+/* This code is used during early startup when statically linked,
+   via __libc_setup_tls in csu/libc-tls.c.  */
+#ifndef SHARED
+# include <dl-symbol-redir-ifunc.h>
+#endif
+
 /* Surplus static TLS, GLRO(dl_tls_static_surplus), is used for
 
    - IE TLS in libc.so for all dlmopen namespaces except in the initial