support .text.* sections on x86_64

Group them in .text. Also add vague linkage sections in .text.

Signed-off-by: David Decotigny <decot@googlers.com>

gnu-efi-3.0/gnuefi/elf_x86_64_efi.lds

@@ -16,6 +16,8 @@ SECTIONS
   .text :
   {
    *(.text)
+   *(.text.*)
+   *(.gnu.linkonce.t.*)
   }
   . = ALIGN(4096);
   .reloc :