Fix x86 build with --enable-tunable=no

Checked on x86_64-linux-gnu.

sysdeps/x86/get-isa-level.h

@@ -16,6 +16,7 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+#include <elf.h>
 #include <sys/platform/x86.h>
 
 /* Get GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234]

sysdeps/x86_64/dl-hwcaps-subdirs.c

@@ -18,6 +18,7 @@
 
 #include <dl-hwcaps.h>
 #include <cpu-features.h>
+#include <ldsodefs.h>
 #include <get-isa-level.h>
 
 const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";